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 2 years ago
Halp meh pliss,
The number of positive values of x less than 360 degrees which satisfy the equation sin 1/2x =cos x is?
a)0 b)1) c)2 d)3 e)4
 2 years ago
Halp meh pliss, The number of positive values of x less than 360 degrees which satisfy the equation sin 1/2x =cos x is? a)0 b)1) c)2 d)3 e)4

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saifoo.khan
 2 years ago
Best ResponseYou've already chosen the best response.1You do math too? D:

hba
 2 years ago
Best ResponseYou've already chosen the best response.1Mujhe bhi yaqeen nahi horaha :P

satellite73
 2 years ago
Best ResponseYou've already chosen the best response.0looks like there are two http://www.wolframalpha.com/input/?i=sin%28x%2F2%29%2Ccos%28x%29+domain+0..2pi

yrelhan4
 2 years ago
Best ResponseYou've already chosen the best response.3write cosx in terms of sin^2 x/2 and solve!

yrelhan4
 2 years ago
Best ResponseYou've already chosen the best response.3you get a quadratic.. solve for x..

yrelhan4
 2 years ago
Best ResponseYou've already chosen the best response.32t^2 + t 1=0 where t=sin(x/2)

uri
 2 years ago
Best ResponseYou've already chosen the best response.0Quad,breaking the middle term or completing the square method?

yrelhan4
 2 years ago
Best ResponseYou've already chosen the best response.3breaking the middle term.. you would get (2t1)(t+1)=0 where t=sin(x/2)

uri
 2 years ago
Best ResponseYou've already chosen the best response.0eh,2t1=0=)t=1/2 t+1=0=)t=1

yrelhan4
 2 years ago
Best ResponseYou've already chosen the best response.3so there would be 3 values of x/2 in 0 to 360.. 30,120,270. so x=60,240,540.. since you want from 0 to 360.. there would be 2 solns..

yrelhan4
 2 years ago
Best ResponseYou've already chosen the best response.3if sin(x/2) = 1/2 , what is x? 0>x>360

yrelhan4
 2 years ago
Best ResponseYou've already chosen the best response.31 sin^2(x/2)= cosx @hba

yrelhan4
 2 years ago
Best ResponseYou've already chosen the best response.3look.. let x/2=k .. sin(k)=1/2 > k=30, 120.. > x=60, 240

yrelhan4
 2 years ago
Best ResponseYou've already chosen the best response.3cosx= 12sin^2 (x/2) @hba missed the two..

sirm3d
 2 years ago
Best ResponseYou've already chosen the best response.2@yrelhan4 since \(\displaystyle 0 \leq x \leq 360\) then \(\displaystyle 0 \leq \frac{x}{2} \leq 180\)

sirm3d
 2 years ago
Best ResponseYou've already chosen the best response.2now, \(\sin x/2 = 1/2\) therefore \(x/2=30, 150\) or \(x=60, 300\)

uri
 2 years ago
Best ResponseYou've already chosen the best response.0Yrelhan GUESSSS WHAT?! I donyt undastand aaaanythang nd ima sho confuzzeld tooh,I caant eveen speel corractly. o.O

yrelhan4
 2 years ago
Best ResponseYou've already chosen the best response.3lol.. i am such a fool.. you are right! @sirm3d

uri
 2 years ago
Best ResponseYou've already chosen the best response.0Wut iz the aaansweeer?! none of my option matches your answer!

yrelhan4
 2 years ago
Best ResponseYou've already chosen the best response.3i just wrotw150 value wrong, right? why am i a fool then? :P

sirm3d
 2 years ago
Best ResponseYou've already chosen the best response.2the other equation, \(\sin x/2 = 1\) has no solution in \(0 \leq \frac{x}{2} \leq 180\)

uri
 2 years ago
Best ResponseYou've already chosen the best response.0@sirm3d sinx/2=1 has no solution so we will leave it? xD

yrelhan4
 2 years ago
Best ResponseYou've already chosen the best response.3@uri its sin(x/2) = 1

sirm3d
 2 years ago
Best ResponseYou've already chosen the best response.2@uri, just count the number of solutions: \(x=60^0,\;300^0\)

yrelhan4
 2 years ago
Best ResponseYou've already chosen the best response.3are kitni baar puchegi? @uri :P

uri
 2 years ago
Best ResponseYou've already chosen the best response.0AMG THANKYOUUUUUUUUUUUUU!AMG THANKYOUU SOO MUCHHHHH!!!! :D

yrelhan4
 2 years ago
Best ResponseYou've already chosen the best response.3mera medal.. :'( .. aadha to maine solve kiya..

yrelhan4
 2 years ago
Best ResponseYou've already chosen the best response.3haha.. he's got 2 now too!
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