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数学
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化简
2sin2α
1+cos2α
•
cos
2
α
cos2α
=______.
人气:364 ℃ 时间:2020-05-22 02:10:19
解答
因为cos2α=2cos
2
α-1
所以:原式=
2sin2α
1+(2
cos
2
α−1)
•
cos
2
α
cos2α
=
2sin2α
2
cos
2
α
•
cos
2
α
cos2α
=
sin2α
cos2α
=tan2α
故答案为:tan2α
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