cos(13/24 π)等于多少?请写一下过程

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cos(13/24π)等于多少?请写一下过程cos(13/24π)等于多少?请写一下过程cos(13/24π)等于多少?请写一下过程cos(13/24π)=cos(4/24π+9/24π)=cos(1

cos(13/24 π)等于多少?请写一下过程
cos(13/24 π)等于多少?
请写一下过程

cos(13/24 π)等于多少?请写一下过程
cos(13/24 π)
=cos(4/24 π+9/24 π)
=cos(1/6 π+3/8π)
=二分之根号三*cos(3/8 π)-0.5sin(3/8π)
=二分之根号三*cos(1/8 π+2/8 π)-0.5sin(1/8 π+2/8 π)
cos(1/8 π+2/8 π)=cos(1/8 π)cos(2/8 π)-sin(1/8 π)sin(2/8 π)=
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