TrigonometrySuperchallengeTrigonometric Identities ShareTrigonometric Identities · Superchallenge problemAn angle θ\thetaθ with 0<θ<π40<\theta<\dfrac{\pi}{4}0<θ<4π satisfies sin8θ+cos8θ=1781\sin^8\theta+\cos^8\theta=\dfrac{17}{81}sin8θ+cos8θ=8117. Find cos2θ−sin2θ\cos^2\theta-\sin^2\thetacos2θ−sin2θ.Check Show answer Walk through it step by step Practice more like this Review this concept