Question

cos ^2+ tan^2=1

do this

Answer 1

Answer:

Answer. The answer2 are: x=kπ and π4+kπ . The equation can be written: cos2x+cos2xtan2x=1⇒cos2x+cos2xsin2xcos2x=1⇒cos2x+sin2x=1⇒sin2x+cos2x=1 .