Question

Упростите: (1-cos^2(П/2+a))+sin^2(2П+a)

Answer 1

$(1-cos^2(frac{pi}{2}+ alpha ))+sin^2(frac{pi}{2}+ alpha )=sin^2(frac{pi}{2}+ alpha )+sin^2(frac{pi}{2}+ alpha )=\\=2sin^2(frac{pi}{2}+ alpha )=2cos^2 alpha$