Question

If sin[x+20]=cos[x-10].find x

Answer 1

Hi ,

Sin ( x + 20 ) = cos ( x - 10 )

Sin( x + 20 ) = sin[ 90 - ( x - 10 )]

x + 20 = 90 - ( x - 10 )

x + 20 + x - 10 = 90

2x = 90 - 10

2x = 80


x = 80/2

x = 40

I hope this helps you.

:)