sin(90°-x)=²/³x=?
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sin(90°-x)=²/³x=?sin(90°-x)=²/³x=?sin(90°-x)=²/³x=?sin(90°-x)=cosx=
sin(90°-x)=²/³x=?
sin(90°-x)=²/³
x=?
sin(90°-x)=²/³x=?
sin(90°-x)=cosx=²/³
cos48°47ˊ=2/3
x=48°47ˊ.
cosx=2/3,取反函数就算出来了
sin(90°-x)=²/³
cosx=2/3
x=arccos2/3