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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
 one year ago
 one year 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
 one year ago
 one year ago

This Question is Closed

saifoo.khanBest ResponseYou've already chosen the best response.1
You do math too? D:
 one year ago

hbaBest ResponseYou've already chosen the best response.1
Mujhe bhi yaqeen nahi horaha :P
 one year ago

satellite73Best ResponseYou've already chosen the best response.0
looks like there are two http://www.wolframalpha.com/input/?i=sin%28x%2F2%29%2Ccos%28x%29+domain+0..2pi
 one year ago

yrelhan4Best ResponseYou've already chosen the best response.3
write cosx in terms of sin^2 x/2 and solve!
 one year ago

yrelhan4Best ResponseYou've already chosen the best response.3
you get a quadratic.. solve for x..
 one year ago

yrelhan4Best ResponseYou've already chosen the best response.3
2t^2 + t 1=0 where t=sin(x/2)
 one year ago

uriBest ResponseYou've already chosen the best response.0
Quad,breaking the middle term or completing the square method?
 one year ago

yrelhan4Best ResponseYou've already chosen the best response.3
breaking the middle term.. you would get (2t1)(t+1)=0 where t=sin(x/2)
 one year ago

uriBest ResponseYou've already chosen the best response.0
eh,2t1=0=)t=1/2 t+1=0=)t=1
 one year ago

yrelhan4Best ResponseYou've already chosen the best response.3
so 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..
 one year ago

yrelhan4Best ResponseYou've already chosen the best response.3
if sin(x/2) = 1/2 , what is x? 0>x>360
 one year ago

yrelhan4Best ResponseYou've already chosen the best response.3
1 sin^2(x/2)= cosx @hba
 one year ago

yrelhan4Best ResponseYou've already chosen the best response.3
look.. let x/2=k .. sin(k)=1/2 > k=30, 120.. > x=60, 240
 one year ago

yrelhan4Best ResponseYou've already chosen the best response.3
cosx= 12sin^2 (x/2) @hba missed the two..
 one year ago

sirm3dBest ResponseYou've already chosen the best response.2
@yrelhan4 since \(\displaystyle 0 \leq x \leq 360\) then \(\displaystyle 0 \leq \frac{x}{2} \leq 180\)
 one year ago

sirm3dBest ResponseYou've already chosen the best response.2
now, \(\sin x/2 = 1/2\) therefore \(x/2=30, 150\) or \(x=60, 300\)
 one year ago

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

yrelhan4Best ResponseYou've already chosen the best response.3
lol.. i am such a fool.. you are right! @sirm3d
 one year ago

uriBest ResponseYou've already chosen the best response.0
Wut iz the aaansweeer?! none of my option matches your answer!
 one year ago

yrelhan4Best ResponseYou've already chosen the best response.3
i just wrotw150 value wrong, right? why am i a fool then? :P
 one year ago

sirm3dBest ResponseYou've already chosen the best response.2
the other equation, \(\sin x/2 = 1\) has no solution in \(0 \leq \frac{x}{2} \leq 180\)
 one year ago

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

yrelhan4Best ResponseYou've already chosen the best response.3
@uri its sin(x/2) = 1
 one year ago

sirm3dBest ResponseYou've already chosen the best response.2
@uri, just count the number of solutions: \(x=60^0,\;300^0\)
 one year ago

yrelhan4Best ResponseYou've already chosen the best response.3
are kitni baar puchegi? @uri :P
 one year ago

uriBest ResponseYou've already chosen the best response.0
AMG THANKYOUUUUUUUUUUUUU!AMG THANKYOUU SOO MUCHHHHH!!!! :D
 one year ago

yrelhan4Best ResponseYou've already chosen the best response.3
mera medal.. :'( .. aadha to maine solve kiya..
 one year ago

yrelhan4Best ResponseYou've already chosen the best response.3
haha.. he's got 2 now too!
 one year ago
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