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lilsis76
Group Title
is x=15 degrees a solution of (( sqrt3)/3) cos2x+sin2x=1? how can i figure this out?
 one year ago
 one year ago
lilsis76 Group Title
is x=15 degrees a solution of (( sqrt3)/3) cos2x+sin2x=1? how can i figure this out?
 one year ago
 one year ago

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campbell_st Group TitleBest ResponseYou've already chosen the best response.1
just substitute x = 15 into each trig ratio and use the exact angle identities below dw:1352142650262:dw if x =15 then 2x = 30.... use the exact values from the triangle above for cos2(15) = cos(30) ans sin2(15) = sin(30)
 one year ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
how did you figure the triangle? even i didnt get or understand how to do that
 one year ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
is the cos sqrt 3 / 2 and the sin 1/2?
 one year ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.1
its called the an exact value triangle and its usually taught during a topic on trigonometry. thats correct now substitute those values to show that you will get 1 as the answer,
 one year ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
okay let me try it. hold on
 one year ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
dw:1352143377873:dw
 one year ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
is this right? so it doesnt equal 1
 one year ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.1
not quite dw:1352143232742:dw
 one year ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
so it doesnt equal 1 still. right?
 one year ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.1
yes it does you need to check the 1st part dw:1352143563524:dw
 one year ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
hold on let me try again, i wrote all sloppy
 one year ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
dw:1352144119351:dw
 one year ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.1
your question says dw:1352143923416:dw
 one year ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.1
substituting the exact values gives dw:1352143978828:dw
 one year ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
okay i see the 2x, is basically that value of cos that is the sqrt 3 /2
 one year ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.1
thats right it x = 15 2x = 30 so you are using cos(30) and sin(30) which are known as exact values.
 one year ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
dw:1352144487645:dw
 one year ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.1
no dw:1352144327997:dw
 one year ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
okay so the answer is 1/2, so the equation does not equal 1
 one year ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.1
I'll write it again dw:1352144410590:dw
 one year ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
okay, so i would cross multiply to the the 6/6 to equal 1?
 one year ago
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