Question

Need help with Solving Trigonometric Equation
solve for x
Cos(2x)= (Cosx)^2
Domain: X is greater than or equal to -360 and less than or equal to 360

Answer 1

oh btw we can use trig identities

Answer 2

cos (2x) = 2cos^2 x -1
so, you have 2cos^2x -1 = cos^2x
therefore cos^2x =1
cos x = \(\pm\) 1
for cosx =1 ; x = 0
for cos x = -1 ; x = pi

Answer 3

ooh ok

Answer 4

thanks