cos(-23π/4)+sin(37π/6)

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cos(-23π/4)+sin(37π/6)cos(-23π/4)+sin(37π/6)cos(-23π/4)+sin(37π/6)cos(-23π/4)+sin(37π/6)=cos(-6π+π/4

cos(-23π/4)+sin(37π/6)
cos(-23π/4)+sin(37π/6)

cos(-23π/4)+sin(37π/6)
cos(-23π/4)+sin(37π/6)
=cos(-6π+π/4)+sin(6π+π/6)
=cosπ/4+sinπ/6
=√2/2+1/2
=(√2+1)/2
应该没出错,若有问题请追问,

cos(-23π/4)+sin(37π/6)
=cos(6π-23π/4)+sin(37π/6-6π)
=cos(π/4)+sin(π/6)
=√2/2+1/2
=(√2+1)/2

如果不懂,请追问,祝学习愉快!

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