化简:cos(π/3+a)+sin(π/6)+a=
人气:499 ℃ 时间:2020-03-14 01:43:59
解答
应该是你打错了吧?!
原式应该是cos(π/3+a)+sin(π/6+a)
=cosπ/3cosa-sinπ/3sina+sinπ/6cosa+cosπ/6sina
=cosa/2-(根号3)/2sina+cosa/2+(根号3)/2sina
=cosa
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