关于高中三角函数(1)1)化简(1+sinx)/cosx - cosx/(1+sinx)2)cos( arcsin( 2倍根号x)/(1+x))3)tanx/secx 4) - √ ((1+cos4x)/(1-cos4x) )(2)找到cot(-390°)的准确值找到arccos(-0.2)的准确值我知道能做的人都
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![关于高中三角函数(1)1)化简(1+sinx)/cosx - cosx/(1+sinx)2)cos( arcsin( 2倍根号x)/(1+x))3)tanx/secx 4) - √ ((1+cos4x)/(1-cos4x) )(2)找到cot(-390°)的准确值找到arccos(-0.2)的准确值我知道能做的人都](/uploads/image/z/5285201-41-1.jpg?t=%E5%85%B3%E4%BA%8E%E9%AB%98%E4%B8%AD%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%EF%BC%881%EF%BC%891%29%E5%8C%96%E7%AE%80%EF%BC%881%2Bsinx%29%2Fcosx+-+cosx%2F%281%2Bsinx%292%29cos%28+arcsin%EF%BC%88+2%E5%80%8D%E6%A0%B9%E5%8F%B7x%29%2F%281%2Bx%29%293%29tanx%2Fsecx+4%29+-+%E2%88%9A+%28%EF%BC%881%2Bcos4x%29%2F%281-cos4x%29+%29%EF%BC%882%EF%BC%89%E6%89%BE%E5%88%B0cot%EF%BC%88-390%C2%B0%EF%BC%89%E7%9A%84%E5%87%86%E7%A1%AE%E5%80%BC%E6%89%BE%E5%88%B0arccos%EF%BC%88-0.2%EF%BC%89%E7%9A%84%E5%87%86%E7%A1%AE%E5%80%BC%E6%88%91%E7%9F%A5%E9%81%93%E8%83%BD%E5%81%9A%E7%9A%84%E4%BA%BA%E9%83%BD)
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