Question

Solve the equation cosx+2cosxsinx=0 for 00≤x≤3600.

Answer 1

Answer:

90°

Step-by-step explanation:

given,

cos x + 2cos x.sin x = 0

=> cos x + sin 2x = 0

=> sin2x = - cosx

=> sin 2x  = sin(90°+x)

=> 2x = 90° + x

=> 2x-x = 90°

=> x = 90°