cos2α=4分之5,则cos4次方α+sin4次方α=
人气:401 ℃ 时间:2019-10-19 10:08:13
解答
cos2α=2cos平方α-1=4/5,解出cos平方α=9/10,sin平方α=1/10,所以cos4次方α+sin4次方α=(9/10)的平方+(1/10)的平方=82/100=41/50
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