cos(-79/6π)怎么做
计算cos^4(π/8)+sin^4(π/8)=____ 怎么做的?
sin(π/4-A)-cos(π/4+A)怎么做
lim(sin(x^2*cos(1/x)))/x怎么做?
cos(-19/6π)
:用泰勒展开式将cos(sinx)、cos(cosx)、sin(cosx)、sin(sinx)展开到x^3项怎么做?
cos^2(π/3-a)+cos^2(π/6+a)
根号2sinπ/32*cosπ/32*cosπ/16*cosπ/18 怎么化简
cos(-19/6π)=?
已知cos(α-π6
已知cos(a+π6
cos^2(π/6)
计算cos(a+5π/12)cos(a+π/6)+cos(π/12-a)cos(π/3-a)