(sin12分之25π乘以cos6分之11π)减去(cos12分之11π乘以sin6分之5π)的值是多少
问题描述:
(sin12分之25π乘以cos6分之11π)减去(cos12分之11π乘以sin6分之5π)的值是多少
答
sin12分之25π乘以cos6分之11π)减去(cos12分之11π乘以sin6分之5π)
=sinπ/12cosπ/6+cosπ/12sinπ/6
=sin(π/12+π/6)
=sinπ/4
=√2/2