求值：sin^2 120+cos 180+tan 45—cos^2（-330）+sin（-210）

求值：sin^2 120+cos 180+tan 45—cos^2（-330）+sin（-210） 求值：cos^2α-sin^2α cos^2(π/5)+sin^2(π/10) 求值 已知tan&=2,求值 sin&+cos&除以sin&—cos& 求值： 2(sin^6 θ+cos^6 θ)-3(sin^4 θ+cos^4 θ) 求值:sin^2α+sin^2β-sin^2α×sin^2β+cos^2α×cos^2β 求值sin(α+β)cosα-[sin(2α+β)+sinβ]/2 求值【sin(2π-α)sin(π+α)cos(-π-α)】/【sin(3π-α)-cos(π-α)】 求值：sin(π/12)+cos(π/12) 求值sin(x-45)+cos(45+x) 求值化简：sinα*cosα sin(π+π/6)-cos(π+π/4)cos(-π/2)+1求值 求值sin平方120度+cos180度+tan45度-cos平方-330度+sin-210度 求值:2sinπ/6+sin3π/2-2cosπ+2sinπ/3 求值:3/(sin^2 20°)-1/(cos^2 20°)+64sin^2 20° 求值sin(π/2)*sin(π/3)+2cos(-π/2)-根号3*tan(π/3) sin^a+cos^(π/6+a)+1/2sin(2a+π/6)求值 求值sin²x+cos²(π/6+x)+1/2sin(2x+π/6)