若cos α+2sin α=-,则tan α=______.
若=2,则sin(θ-5π)sin=________.
已知sin(π-α)=log8,且α∈,则tan(2π-α)的值为________.
已知sin(3π+α)=2sin(+α),求下列各式的值:
(1);
(2)sin2α+sin2α.
若3cos(-θ)+cos(π+θ)=0,则cos2θ+sin2θ的值是________.
已知函数f(x)=asin(πx+α)+bcos(πx+β),其中a,b,α,β都是非零实数且满足f(2013)=-1,则f(2014)=________.
已知函数,.
(1)求的值;
(2)求的最大值和最小正周期;
(3)若,是第二象限的角,求.