计算:⑴cos^2 30°+sin^2 30°-tan45° ⑵cos30°-sin°45/sin°60-Cos°45.
计算:sin²30°+cos²45°+根号2sin60°×tan45°
tan²30°+cos²30°-sin²45°tan45°
sin平方120°+cos180°+tan45°-cos平方(-330°)+sin(-210°)
tan45度减4cos^30度分之sin^60度减tan30度cos30度等于?
(cos 45°-sin 30°)/(cos 45°+sin 30°)
2cos 30°-2sin 60°·cos 45°=?
化简cos ﹙α+30 °﹚cos30° +sin﹙α+30°﹚sin30°
计算[3/(sin^2)20°-[1/(cos^2)20°]+64(sin^2)20°
cos tan sin 30° 45° 60°是多少
[sin(45°+θ)]/[cos(45°-θ)]-[cos(θ+60°)]/[sin(θ+30°)]=?
为什么根号3sinα+cosα=2sin(α+30°)
√(cos 60°-1)²+2√cot 45°-sin 60°+|sin 30°-1|=?