[－π/2,π/2]sin^2 X/2dx求定积分

sin^2(π/3-x)+sin^2(π/6+x) 2sin(x+π/4)sin(x-π/4)=? sin^2(π/4 +x) sin(πx/2)求导 化简 sin²x+sin²(x+2π/3)+sin²(x-2π/3) 下列函数中,在(0,π/2 )上有零点的函数是(A) f (x)＝sin x－x (B) f (x)＝sin x－2/πx(C) f (x)＝sin^2(x)－x (D) f (x)＝sin^2(x)-2/πx 下列函数中,在（0,派/2）上有零点(A) f (x)＝sin x－x (B) f (x)＝sin x－2/πx(C) f (x)＝sin^2(x)－x (D) f (x)＝sin^2(x)-2/πx 已知sin(π/2-x)+sin(π-x)/cos(-x)+sin(2π-x)=2009,则tan(x+5π/4)等于?已知sin(π/2-x)+sin(π-x)/cos(-x)+sin(2π-x)=2009,则tan(x+5π/4)等于（） A.-2009 B.-1/2009 C.1/2009 D.2009 y=sinx+cosx可化成_____?A.2sin(x-π/4)；B.2sin(x+π/4)； C.√2sin(x-π/4)；D.√2sin(x+π/4)； 求证:(sin 2x /(1-cos 2x) )·(sin x /(1+sin x))=tan (π/4-x/2). 函数y=(cos x+sin x)/(cos x-sin x)的最小正周期是多少?A.1 B π/2 C 2π D π 若f(x)sin x是周期为π的奇函数,则f(x)可以是( )． A．sin x B．cos x C．sin 2x D．cos 2x 函数f(x)=cos2x+cos(x+π/3)+sin(x+π/6)+3sin^2x的最小值A.0 B.2 C.9/4 D.3 化简sin（2π+x）cos（π-x）sin（π-x）/cos（x-π）sin（-π-x）sin（π+x） f(x)=（1+cotx)sin^2x-2sin(x+π/4)sin(x-π/4)还有一题, 已知函数f(x)=(1+1 anx)sin^2x+m sin(x+π/4)sin(x-π/4) 已知-π/2＜x＜0,sin x+cos x=1/5求sin 2x+2 sin sin(x^2)/sin^2x 求导