sin(-26/6π)sin(-46/3π)-cos(-37/6π)tan(-55/6π)求值,
问题描述:
sin(-26/6π)sin(-46/3π)-cos(-37/6π)tan(-55/6π)求值,
答
sin(-26/6π)sin(-46/3π)-cos(-37/6π)tan(-55/6π)=sin(4π-26/6π)sin(16π-46/3π)-cos(6π-37/6π)tan(10π-55/6π)=sin(-1/3π)sin(2/3π)-cos(-1/6π)tan(5/6π)=-sin(1/3π)sin(π-1...