Question

prove that sin4. theta + cos 2 theta\1-2 sin2 theta cos 2 theta=1

Answer 1

nice question but not of my level

Answer 2

Answer:

Consider a right-angled triangle, ΔABC, where ∠BAC=θ,



By the Pythagorean theorem,AC2+BC2=AB2Dividing by AB2,⇒AC2AB2+BC2AB2=AB2AB2⇒(oppositehypotenuse)2+(adjacenthypotenuse)2=AB2AB2=1⇒sin2θ+cos2θ=1

Step-by-step explanation: