计算:√3sin(-20/3∏)-cos13/4π×tan(-37/4π)

问题描述:

计算:√3sin(-20/3∏)-cos13/4π×tan(-37/4π)

√3sin(-20/3π)-cos13/4π×tan(-37/4π)
=√3sin(-7π+1/3π)-cos(3π+1/4π)×tan(-9π-1/4π)
=-√3sin(1/3π)+cos(1/4π)×tan(-1/4π)
=-√3×(√3/2)+√2/2×(-1)
=-(3+√2)/2