化简3/(sin^220°)-1/(cos^220°)+64sin^220°
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化简3/(sin^220°)-1/(cos^220°)+64sin^220°化简3/(sin^220°)-1/(cos^220°)+64sin^220°化简3/(sin^220°)-1/(cos^22
化简3/(sin^220°)-1/(cos^220°)+64sin^220°
化简3/(sin^220°)-1/(cos^220°)+64sin^220°
化简3/(sin^220°)-1/(cos^220°)+64sin^220°
3/sin^2 20-1/cos^2 20+64sin20
=[3(cos20)^2-(sin20)^2]/(sin20)^2(cos20)^2+64(sin20)^2
=[(√3cos20+sin20)(√3cos20-sin20)]/(sin20cos20)^2+64(sin20)^2
=[2sin(60+20)*2sin(60-20)]/[(sin40)/2]^2+64(sin20)^2
=16sin80sin40/sin40*sin40+64(sin20)^2
=16sin80/sin40+64(sin20)^2
=32sin40cos40/sin40+64(sin20)^2
=32cos40+64(sin20)^2
=32[1-2(sin20)^2]+64(sin20)^2
=32
sin²1°+sin²2°+sin²3°+...+sin²89°化简
化简3/(sin^220°)-1/(cos^220°)+64sin^220°
sin²1°+sin²2°+sin²3°+.+sin²89
计算：sin²1°+sin²2°+sin²3°...+sin²45°+sin²46°...+sin²89°
计算：sin²1°+sin²2°+sin²3°+...+sin²87°+sin²88°+sin²89°
sin²1°+sin²2°+sin²3°+……+sin²87°+sin²88°+sin²89°=
sin²1°+sin²2°+sin²3°+...+sin²88°+sin²89°+sin²90°=等于多少?
化简:(3/sin^20)-(1/cos^20)+64sin^20
已知cos阿尔法等于3分之1,且-2分之pai小于阿尔法小于0,求sin（-阿尔法-pai）co（-阿尔法）tan阿尔法分之cos（-阿尔法-pai）•sin（2pai+阿尔法）的值
sin²1°+sin²2°+sin²3°+.+sin²89°= -1为什么?
sin²1°+sin²2°+sin²3°……sin²89°=?
sin²1°+sin²2°+sin²3°……sin²89°=
sin²1°+sin²2°+sin²3°…+sin²89°的值是多少
sin²1°+sin²2°+sin²3°+...+sin²90°的值
sin²1°+sin²2°+sin²3°+...+sin²90°等于多少?要解析
求sin²1°+sin²2°+sin²3°……sin²89°=?
sin²1°+sin²2°+sin²3°.+sin²89°=
化简[1-(sin^4 x-sin^2 xcos^2 x+cos^4 x)]/(sin^2 x)+3sin^2 x