化简:sin^2(75°)*cos^2(15°)-cos^2(75°)*sin^2(15°)

化简:sin^2(75°)*cos^2(15°)-cos^2(75°)*sin^2(15°) 化简:sin^2(75°)*cos^2(15°)-cos^2(75°)*sin^2(15°) sin^2cos^2化简 化简：1+sinθ+cosθ+2sinθcosθ /1+sinθ+cosθ 化简 （1+sin a+ cos a)(sin a/2 - cos a/2) / √(2+2cos a)(180° 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 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(-α)-[tan(360°+α)/sin(-α)] 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