Question

cos(2x+10)=sin(x=20)

Answer 1

use the identity :
sin(x) = cos(90-x)

Answer 2

wait, in right side is that sin(x+20) ?

Answer 3

yes

Answer 4

ok, look at this how to solve this

Answer 5

cos(2x+10)=sin(x+20)
cos(2x+10)=cos(90 -(x+20))
cos(2x+10)=cos(90 - x - 20)
cos(2x+10)=cos(70 - x )

cancel out the cos, in both side

2x+10 = 70 - x
now, can u solve for x

Answer 6

thank you!

Answer 7

you're welcome
but what's ur answer ?

Answer 8

20

Answer 9

??

Answer 10

x = ............. ?

Answer 11

that's right, good finishing ^_^