cos432-cot329+tan139*cot499+cos252-cot571

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cos432-cot329+tan139*cot499+cos252-cot571
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cos432-cot329+tan139*cot499+cos252-cot571
cos432-cot329+tan139*cot499+cos252-cot571

cos432-cot329+tan139*cot499+cos252-cot571
=cos72°+cot31° +tan139°*cot139°+cos108°-cot31°
=cos72°-cos72°+tan139°*cot139°+cot31° -cot31°
=0+1+0
=1

cos432-cot329+tan139*cot499+cos252-cot571 (tan139-tan19+tan240)/tan139tan19=? cos87°*cos432°-sin93°cos198° 求cos87°cos432°-sin93°cos198°的值 cos87乘以cos432的积再减去sin93乘以cos198的积,化简结果是多少?答案是根号6加根号2的和除以4,为什么?