Question

help

Answer 1

question?

Answer 2

use
sin 2x = 2 sin x cos x

Answer 3

Then factor the cosine out.

Answer 4

nevermind my last answer

Answer 5

2 sin x cos x +cos x = 0
factoring out cos x because it is common in both the terms

cos x (2 sin x+1) = 0

cos x = 0 find the values of x
2 sin x +1 = 0 , find sin x , then other values of x

Answer 6

@hartnn

cos x = 0 then the answers are 1 and -1 right?

Answer 7

its zero and 2pi/3 right?

Answer 8

nopes, x is an angle, will be in radians

cos x = 0
x = pi/2 , 3pi/2

Answer 9

sin x = 0 gives x = 0

Answer 10

infact, sin x =0, gives x=0,2pi

Answer 11

but we here need
2 sin x +1 =0
sin x = -1/2
for which 2 angles ?

Answer 12

7pi/6 and 11pi/6?

Answer 13

correct!
so your angles are
pi/2, 3pi/2,7pi/6 , 11pi/6
:)

Answer 14

when i write my answer should i specify that the first two are cosine and next 2 are sine?
or just list all four?

Answer 15

just list them :)

Answer 16

thanks

Answer 17

welcome ^_^