sin(30+x)=5/13,60
已知sin(x+30)=12/13,且60
∫sin(5x)sin(7x)dx=
s = 2*sin(x)-sin(2*x)+2/3*sin(3*x)-1/2*sin(4*x)+2/5*sin(5*x)
已知sin[(π/4)-x)]=5/13,0
已知sin(TT/4+x)=5/13,0
sin(pi/4-x)=5/13 0
sin(45-3x)*cos(60-3x)-cos(30+3x)*sin(45+3x)
sin(45-3x)*cos(60-3x)-cos(30+3x)*sin(45+3x) ?
证明sin^2(x)+cos^2(x+30)+sin(x)cos(x+30)=3/4
x=30*sin(5*360*t)是什么意思
5sin^2(X)+sin(2X)-cos^2(X)=1, 求解X
已知sin(x+π/6)=1/3,求sin(5π/6-x)+sin^2(π/3-x)