(1+Cos45°-Sin30°)(1-Sin45°+Cos60°)
=(1+√2/2-1/2)(1-√2/2+1/2)
=(1/2+√2/2)(3/2-√2/2)
=3/4+√2/2-1/2
=1/4+√2/2
(1+Cos45°-Sin30°)(1-Sin45°+Cos60°)=
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相关问题
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1.cos30°-sin45°/sin60°-cos45° 2.(sin30^2)30°+2sin60°+tha45°-
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计算：(sin60°−cos45°)(cos30°+sin45°)cos245°+cot60°•sin60°-3cot6