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tanα-1/ tanα+1=3+2√2,则sin2α=多少?
( tanα-1)/( tanα+1)=3+2√2,则sin2α=多少?
人气:197 ℃ 时间:2020-05-30 20:51:17
解答
(3+2√2-1)tanα+3+2√2+1=0 (2+2√2)tanα+4+2√2=0 (2+2√2)tanα+2(2+√2)=0 tanα+2=0 tanα=-2 sin2α =2tanα/[1
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