sin^4+sin^2xcos^2x+cos^2x 证明 =1
问题描述:
sin^4+sin^2xcos^2x+cos^2x 证明 =1
答
sin^4+sin^2xcos^2x+cos^2x
=sin^2x(sin^2x+cos^2x)+cos^2x
=sin^2x+cos^2x
=1.