sin(-23/6π)的值?
已知sin(x+π/6)=1/4,则sin(7π+x)+sin^2(5π/6-x)的值
已知sin(x+π/6)=-3/5,求sin²(π/3-x)-sin(5π/6-x)的值
f(x)=2sin[wx-(π/6)]sin[wx+(π/3)]=sin[2wx-(π/3)],求w的值,答案说w=1,
已知α∈(0,π|2),2tanα+3sinβ=7,且tanα-6sinβ=1,求sinα的值
已知6sin^2α+sinαcosα-cos^2α=0,求sin(2α+π/3)的值
求函数y=sin(x+π/6)sin(x-π/6)+acos的最大值.(其中a为定值)
求证sin^2α+cosαcos(π/3+α)-sin^(π/6-α)的值与α无关
已知sin(x+π/6)=0.25,则sin(5π/6-x)+sin(π/3-x)*sin(π/3-x)的值为多少
sin(π/6)的平方怎么做
已知sin(3π+a)=2sin[(3π/2)+a],求sin^2a+sin2a的值
(cos π/8+ sin π/8 ) (cos^3 π/8+sin^3 π/8 )的值.
sin(x+11π/6)=sin(x-π/6)怎么得到的