cos^245°+1/2tan45°-tan60°分之tan30°-sin60°

cos^245°+1/2tan45°-tan60°分之tan30°-sin60° (tan30°+tan45°)/(1-tan30°tan45°)-2sin60°-sin^2 40°-cos^2 40° 绝对值tan60°-tan45°+根号下cos²30°-2cos30°+1 1/2sin30°-tan45°快 tan的平方30°+2sin60°.cos45°+tan45°-cos的平方30°-1/tan60° sin^2 30°+2sin60°+tan45°-tan60°-cos^2 30°是不是等于1/2? sin60°+2sin30°*tan45°- √(cos^2 30°-2cos30°+1) = tan45°+tan15°/1-tan45°tan15° sin²30°+2sin60°+tan45°-tan60°+cos²30° sin²25°+2sin60°+tan45°-tan60°+cos²25°= sin²30°+2sin60°+tan45°-tan60°+cos²30° sin^230°+2sin^260°+tan45°-tan60°+cos^230°= sin的平方30°+cos的平方45°+√2sin60°*tan45° sin²30°+cos²45°+✔2sin60°×tan45° sin²30°+2sin60°+tan45°+cos²30° 计算 cos²45°/sin²45°-tan45° cos²45°-1/cos60°+1/tan45°+cos²30°+sin²45° 2cos30°-tan45°-√(1-tan60°)^2