sin(30°+x)-sin(30°-x)等于多少?
sin(sin(sin(sin(x)=cos(cos(cos(cos(x),X等于多少?
sin(-x) cos(-x)等于多少
sin(15)×sin(30)×sin(75)等于多少
SIN(30度-X)=1\3,则COS(120度+2X)等于多少.
sin x(sin x+cos x)=1求x等于多少
已知sin (30°) = 0.5,sin (45°) = 0.707,sin (40°)利用线性插值计算等于多少?
设x为锐角,若cos(x+30°)=4/5 ,sin(2x+15°)等于?
sin^3x-cos^3x化简等于多少
sin^2(x)cos^2(x)积分等于多少
∫sin x*e^(-x)dx等于多少?
∫x sin x²dx等于多少
cos^2x-sin^2x等于多少?