化简sin^2(20')+cos^2(80')+根号下3*sin20'*cos80'

sin^2cos^2化简 化简：1+sinθ+cosθ+2sinθcosθ /1+sinθ+cosθ 化简4sin派/8*cos派/8*(cos^2派/8-sin^2派/8) 化简 (1-2sin@cos@)/(cos@^2-sin@^2)*(1+2sin@cos@)/(1-2sin@^2) 两分式相乘 2sin@+cos@等于? 化简(sin x+cos x-1)(sin x-cos x+1)/sin 2x sin^2(20)-sin^2(25)sin(20)+cos^2(50)+cos^2(25)sin20 化简sin(α-5π)/cos(3π-α)×cos(π/2-α)/sin(α-3π)×cos(8π-α)/sin(-α-4π) 化简cos(a+b)cos(a-b)+sin^2b 化简sin(x)cos(x)cos(2x) 化简sin(x)cos(x)cos(2x) 化简(sin a^2/cos a +cos a)*cot a sin x cos x cos 2x 化简 化简：(sin²αtanα+cos²α/tanα+2sinαcosα)sinαcosα 化简 cos^2(x)*sin^2(x)-sin^2(x) 化简 cos^(2)(x)*sin^(2)(x)-sin^(2)(x) 化简sin^2a-cos^2a 化简sin(a/2)cos(a/2)