sinx=sin(90°-x) x=?
函数f(x)=sinx-sin(x-π3
3)已知函数f(x)=sinx+sin(x+90°),x属于R
证明sin(x+y)sin(x-y)=sinx-siny
(sinX+sinθ) .(Sinx-sinθ)=sin(x+θ).cos(x-θ)证明
1、sin(2x+B)/sinx - 2cos(x+B)=sinB/sinx
为什么(sin²x)' = 2sinx(sinx)'
sin²x+sinx=1则sinx等于多少?
2sinx=sin(60-x),求sinx的值
判函数f(x)=lg(sinx+1+sin
证明sin(x+y)sin(x-y)=(sinx)^2-(siny)^2.
sin(x+△x)-sinx=2sin△x/2.cos(x+△x/2)
2sin(x-π/4)sin(x+π/4)=(sinx-cosx)(sinx+cosx)=-cos2a