sec[arcsin(1392/1417)]，怎么解答 secarctanx等于多少
更新时间：2022-01-05 11:01:45•作者：DARIN•阅读 7022
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sec(arcsin(3/4))怎么解答
解：令arcsin(3/4)=α,
则，sinα=3/4.
cosα=√(1-sin^2α)=√7/4,
secα=1/cosα,
=1/(√7/4),
=4√7/7,
∴sec(arcsin(3/4)=4√7/7.
解：令arcsin(3/4)=α,
则，sinα=3/4.
cosα=√(1-sin^2α)=√7/4,
secα=1/cosα,
=1/(√7/4),
=4√7/7,
∴sec(arcsin(3/4)=4√7/7.