sin(-14/3π)+cos(-20/3π)+tan(-53/6π)

sin(-14/3π)+cos(-20/3π)+tan(-53/6π) 计算:sin(-14π/3)+cos(-20π/3)+tan(-53π/6) 怎样化简函数 cosπ/4cosπ/3-sinπ/4sinπ/3cosπ/4cosπ/3-sinπ/4sinπ/3 化简:(3/sin^20)-(1/cos^20)+64sin^20 (cosπ/8+sinπ/8)（cos^3π/8-sin^3π/8） (cosπ/8+sinπ/8)（cos^3π/8-sin^3π/8）. (cos π/8+ sin π/8 ) (cos^3 π/8+sin^3 π/8 )的值. 利用和差角公式化简 (2)sin(π/3+α)+sin(π/3-α)(2)sin(π/3+α)+sin(π/3-α)(3)cos(π/4+α)-cos(π/4-α)(4)cos(60°+α)+cos(60°-α)(5)sin(α-β)cosβ+cos(α-β)sinβ(6)cos(α+β)cosβ+sin(α+β)sinβ sin cos之间怎么转换?sin(π/3-2X）等于cos多少? cot(π+θ)=2,则(3sinθ-cosθ)/(sinθ+cosθ)=? 由cos(a+b)=cos a cos b-sin a sin b cos(a-b)=cos a cos b+sin a sin b解题设a为锐角,证：1、2分之根3乘cos a + 2分之1乘sin a=cos(6分之π-a)2、cos a-sin a=根号2cos(4分之π+a) 化简:sin(2π-α)cos(π+α)cos(11π/2-α)/cos(π-α)sin(3π-α)sin(-π-α)sin(9π/2+α) (1+sinα+cosα)*[sin(α/2)-cos(α/2)]/√(2+2cosα)化简 （3/2*π 化简sin(-π/2-α)sin(πα)cos(-α-π)/cos(π-α)sin(3π α) 化简 sin(2π-a)sin(π+a)cos-π-a) / sin(3π-a)cos(π-a) 求值【sin(2π-α)sin(π+α)cos(-π-α)】/【sin(3π-α)-cos(π-α)】 （sinθcosπ/3）-（cosθsinπ/3）怎么化简得sin(θ-π/3) [Sin(6π+a)Cos(7π-a)]/[Sin(3π+a)+Sin(-π+a)