计算1-sin^2acos^2β+cos^2αsin^2β
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计算1-sin^2acos^2β+cos^2αsin^2β
计算1-sin^2acos^2β+cos^2αsin^2β
计算1-sin^2acos^2β+cos^2αsin^2β
=1-sin^2a(1-sin^2β)+(1-sin^2α)sin^2β
=1-sin^2a+sin^2β
=cos^2a+sin^2β
计算1-sin^2acos^2β+cos^2αsin^2β
计算1-sin^2acos^2β+cos^2αsin^2β
已知tana=-1/3,计算:1/2sin acos a+cos²a
求证1+sin a+cos a+2sin acos a/1+sin a+cos a=sin a+cos a
已知sin a+cos a= -1/5 求1)sin acos a 2)sin a-cos a
求证sin^4a+cos^4a=1-2sin^2acos^2a
sin^4a-sin^2acos^2a+cos^2a=1
求证(1-sin^2Acos^2A)(cos2A)=cos^6A-sin^6A
求证sin^6A+cos^6A=1-3sin^2Acos^A
化简:sin^2a+sin^2β-sin^2asin^2β+cos^2acos^2β
求证:sin^2A+sin^2B-sin^2Asin^2B+cos^2Acos^2B=1
化简sin^2asin^2b+cos^2acos^2b-1/2cos2acos2brt
sin acos b=1/2,则cos asin b的取值范围
化简sin²Asin²B+cos²Acos²B-1/2cos2Acos2B
化简sin^2acos^b-cos^2asin^2b+cos^a-cos^2b
求证 cos^2 a-sin^2 a/1-2sin acos a =1+tan a/1-tan a
已知cos2a=(1/4),求cos^4a+sin^4+sin^2acos^2a的值
证明:(sin²)²a+(cos²)²a=1-2sin²acos²a.