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LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1come on no has helped you with this yet?

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1should i solve this or go to sleep.....

ta123
 3 years ago
Best ResponseYou've already chosen the best response.1solve before going, please

ta123
 3 years ago
Best ResponseYou've already chosen the best response.1Oops! forgot to sleep after going

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1okay, first things first, lets find the first derivaitve of the function your where given

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1can you find it?

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1now can you please evaluate: f(pi/4)=9sec^2(pi/4)

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1basically to make it more accesible we can write this as: f(pi/4)=9[sec(pi/4)]^2

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1further more we can write it as: f(pi/4)=9[1/cos(pi/4)]^2

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1then evalutaing we get: f(pi/4)=9[1/sqrt(2)/(2)]^2

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1further: f(pi/4)=9[sqrt(2)]^2 which the gives us: f(pi/4)=9(2), which is 18 Thus f(pi/4)=18

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1yes, look at the unit circle, at pi/4 or 45 degrees, cos is sqr(2)/2, now if we rationalize the numerator we get just sqrt(2)

ta123
 3 years ago
Best ResponseYou've already chosen the best response.1oh, thought your doing sec

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1i rewrote secx as 1/cosx

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1just to make is easier for me, but if realise that sec(pi/4) is sqrt(2) then more power to you

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1Now we have found the slope (m) of our line, it is 18

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1yes, but we will use this form, y=mx+b

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1i am getting sleepy lets finish this problem

ta123
 3 years ago
Best ResponseYou've already chosen the best response.1what would be the b in the slope formula

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1Now remeber we said, that we have the x coordinate in the beining of pi/4, lets evaluate the orginal function at this point, this will give us the y in our line. f(pi/4)=9tan(pi/4) =9(1) =9 now we have our x which is pi/4, we have our slope which is 18, lets plug this info into our line: 9=18(pi/4)+b this means that b is = to 918pi/4

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1now lets substitute everyting in: y=18x(3618pi)/(4)

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1i combined 9 and 18pi/4

ta123
 3 years ago
Best ResponseYou've already chosen the best response.1still don't see how you can 36??

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1dw:1316152625201:dw

ta123
 3 years ago
Best ResponseYou've already chosen the best response.1you could've just simplify it to 9pi/2

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1okay, then smarty pants do it your way, regardless we came to a correct answer

ta123
 3 years ago
Best ResponseYou've already chosen the best response.1sorry, so the finally would look like this 18x+9(1pi/2)

ta123
 3 years ago
Best ResponseYou've already chosen the best response.1I just look the answer choices and so which one was the closest, but how come they have it 18x+9(1pi/2) instead of just 18x+9pi/2

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1distribute the negative sign, first

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1dw:1316153351852:dw

ta123
 3 years ago
Best ResponseYou've already chosen the best response.1but was there a 918pi/4 at the beginning

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1can you not see it: dw:1316153548845:dw

ta123
 3 years ago
Best ResponseYou've already chosen the best response.1I meant why was 918pi/4 at the begginig

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1above i accidentally wrote:y=18x(3618pi)/(4), but is was really suppose to be : y=18x+(3618pi)/(4), sorry about the typo

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1okay, so can we lay this problem to rest?

ta123
 3 years ago
Best ResponseYou've already chosen the best response.1I guess, but still don't get why they have 918pi/4 plug into b instead of just 18pi/4 by itself

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1Now remeber we said, that we have the x coordinate in the beining of pi/4, lets evaluate the orginal function at this point, this will give us the y in our line. f(pi/4)=9tan(pi/4) =9(1) =9 now we have our x which is pi/4, we have our slope which is 18, lets plug this info into our line: 9=18(pi/4)+b this means that b is = to 918pi/4

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1dw:1316153804630:dw

ta123
 3 years ago
Best ResponseYou've already chosen the best response.1oh, ok now we can lay this problem to rest, thanks so much for being patience

LagrangeSon678
 3 years ago
Best ResponseYou've already chosen the best response.1its good you ask questions, i know i can confusing sometimes :)

ta123
 3 years ago
Best ResponseYou've already chosen the best response.1Thanks for giving me a metal

ta123
 3 years ago
Best ResponseYou've already chosen the best response.1yeah I just want to understand the problem instead of just getting the answer

ta123
 3 years ago
Best ResponseYou've already chosen the best response.1because I might see it on the test, but thanks again
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