已知a角的终边经过p(4/5,3/5)求sina的值2.sin(π/2-a)/sin(a-π)乘以tan(a-π)/cos(3π-a)的值.
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![已知a角的终边经过p(4/5,3/5)求sina的值2.sin(π/2-a)/sin(a-π)乘以tan(a-π)/cos(3π-a)的值.](/uploads/image/z/4314655-55-5.jpg?t=%E5%B7%B2%E7%9F%A5a%E8%A7%92%E7%9A%84%E7%BB%88%E8%BE%B9%E7%BB%8F%E8%BF%87p%284%2F5%2C3%2F5%29%E6%B1%82sina%E7%9A%84%E5%80%BC2.sin%EF%BC%88%CF%80%2F2-a%EF%BC%89%2Fsin%28a-%CF%80%EF%BC%89%E4%B9%98%E4%BB%A5tan%28a-%CF%80%29%2Fcos%283%CF%80-a%29%E7%9A%84%E5%80%BC.)
已知a角的终边经过p(4/5,3/5)求sina的值2.sin(π/2-a)/sin(a-π)乘以tan(a-π)/cos(3π-a)的值.
已知a角的终边经过p(4/5,3/5)求sina的值
2.sin(π/2-a)/sin(a-π)乘以tan(a-π)/cos(3π-a)的值.
已知a角的终边经过p(4/5,3/5)求sina的值2.sin(π/2-a)/sin(a-π)乘以tan(a-π)/cos(3π-a)的值.
r=1.sina=y/r=3/5
sin(π/2-a)/sin(a-π)乘以tan(a-π)/cos(3π-a)的
=cosa/-sina*tana/-cosa
=tana/sina
=sina/cosa*sina
=sin^2a/cosa