化简以下各数式a)1÷cos²θ-1=?b)1÷cosθ-sinθtanθc)sinθ÷(开根号1-cos²θ)d)1=tan²θe)6sinθ÷sin(90°-θ)f)4cos(90°-θ)-cosθ÷tan(90°-θ)如可以的话,请顺便加上步骤,
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![化简以下各数式a)1÷cos²θ-1=?b)1÷cosθ-sinθtanθc)sinθ÷(开根号1-cos²θ)d)1=tan²θe)6sinθ÷sin(90°-θ)f)4cos(90°-θ)-cosθ÷tan(90°-θ)如可以的话,请顺便加上步骤,](/uploads/image/z/2600923-67-3.jpg?t=%E5%8C%96%E7%AE%80%E4%BB%A5%E4%B8%8B%E5%90%84%E6%95%B0%E5%BC%8Fa%291%C3%B7cos%26sup2%3B%CE%B8-1%3D%3Fb%291%C3%B7cos%CE%B8-sin%CE%B8tan%CE%B8c%29sin%CE%B8%C3%B7%EF%BC%88%E5%BC%80%E6%A0%B9%E5%8F%B71-cos%26sup2%3B%CE%B8%EF%BC%89d%291%3Dtan%26sup2%3B%CE%B8e%296sin%CE%B8%C3%B7sin%EF%BC%8890%C2%B0-%CE%B8%EF%BC%89f%294cos%2890%C2%B0-%CE%B8%EF%BC%89-cos%CE%B8%C3%B7tan%EF%BC%8890%C2%B0-%CE%B8%EF%BC%89%E5%A6%82%E5%8F%AF%E4%BB%A5%E7%9A%84%E8%AF%9D%2C%E8%AF%B7%E9%A1%BA%E4%BE%BF%E5%8A%A0%E4%B8%8A%E6%AD%A5%E9%AA%A4%2C)
化简以下各数式a)1÷cos²θ-1=?b)1÷cosθ-sinθtanθc)sinθ÷(开根号1-cos²θ)d)1=tan²θe)6sinθ÷sin(90°-θ)f)4cos(90°-θ)-cosθ÷tan(90°-θ)如可以的话,请顺便加上步骤,
化简以下各数式
a)1÷cos²θ-1=?
b)1÷cosθ-sinθtanθ
c)sinθ÷(开根号1-cos²θ)
d)1=tan²θ
e)6sinθ÷sin(90°-θ)
f)4cos(90°-θ)-cosθ÷tan(90°-θ)
如可以的话,请顺便加上步骤,
化简以下各数式a)1÷cos²θ-1=?b)1÷cosθ-sinθtanθc)sinθ÷(开根号1-cos²θ)d)1=tan²θe)6sinθ÷sin(90°-θ)f)4cos(90°-θ)-cosθ÷tan(90°-θ)如可以的话,请顺便加上步骤,
a)1÷cos²θ-1=(sin²θ+cos²θ)/cos²θ-1=tan²θ
b)1÷cosθ-sinθtanθ=1/cosθ-sinθ*sinθ/cosθ=(1-sin²θ)/cosθ=cosθ
c)sinθ÷(开根号1-cos²θ)=sinθ/|sinθ|=正负1 根据sinθ的正负号来判断结果
d)1=tan²θ 则tanθ=正负1 则θ=派/4+k派/2 (k取1,2,3……)
e)6sinθ÷sin(90°-θ)=6sinθ/cosθ=6tanθ
f)4cos(90°-θ)-cosθ÷tan(90°-θ)=4cos(90°-θ)-sin(90-θ)/tan(90-θ)=4cos(90°-θ)-cos(90°-θ)=3cos(90°-θ)=3sinθ