cos三分之7π的值是求详细解答
问题描述:
cos三分之7π的值是求详细解答
答
原式= cos(2π+π/3)
=cos(π/3)
=1/2
cos三分之7π的值是求详细解答
原式= cos(2π+π/3)
=cos(π/3)
=1/2