sin30°+cos45°乘以sin45°-tan602sin²60°乘以tan45°+cos30°乘以tan30°
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sin30°+cos45°乘以sin45°-tan602sin²60°乘以tan45°+cos30°乘以tan30°
sin30°+cos45°乘以sin45°-tan60
2sin²60°乘以tan45°+cos30°乘以tan30°
sin30°+cos45°乘以sin45°-tan602sin²60°乘以tan45°+cos30°乘以tan30°
1, sin30°=1/2 cos45°=sin45°=根号2/2 tan60°=跟号3
原式=1/2+跟号2×跟号2—跟号3=1—跟号3
2, sin60°=cos30°=跟号3/2 tan45°=1 tan30°=跟号3/3
原式=2×(跟号3/2)²+跟号3/2×跟号3/3=2
sin45°×cos45°-sin30°
sin30°+cos45°乘以sin45°-tan602sin²60°乘以tan45°+cos30°乘以tan30°
计算:sin30°+cos45°*sin45°-tan60°
cos30°cos45°+sin30°sin45°等于多少?
sin30°+(cos45°)∧2+tan60°-cot3°+sin45°cos45°
sin45°+cos45°
sin30°+cos45°
sin60°×cos60°+sin45°×cos45°-sin30°×cos30°等于多少
sin30° sin45° sin60° cos30° cos45° cos60° 以此类推,都等于多少
计算cos45°-cos60°分之sin30°-2sin45°+根号3tan30°
sin30°+1/2(sin45°+cos45°)-sin^2 20°-cos^2 20°
1/2cos30°+根号2/2cos45°-sin30°-sin45°
(1+Cos45°-Sin30°)(1-Sin45°+Cos60°)=
sin60 sin30 cos60 cos30 sin45 cos45 tan30 tan60 tan45°各等于多少
sin45°乘以sin30°减去sin45°乘以sin60°等于?
计算下列各式的值.cos30°sin45°+sin30°cos45°2cos45°+|根号2-根号3|根号3cos30°+根号2sin45°
(cos45°sin30°)÷(cos45°+sin30°)
sin75°=sin30°cos45°+cos30°sin45 为什么是这样算的?是公式么?就是说sin75=sin(45+30) 然后为什么变形成sin30°cos45°+cos30°sin45