求教初中锐角三角函数问题.求助几道三角函数的题:1.已知sin a *cos a =1/8 且45°<∠a<90°,则cos a -sin a 的值是?2.已知a 为锐角,sin a =cos50°,则a等于?3.设a 为锐角,sin a =3 cos a 则cos a*sin a等于?4.1/4*t
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![求教初中锐角三角函数问题.求助几道三角函数的题:1.已知sin a *cos a =1/8 且45°<∠a<90°,则cos a -sin a 的值是?2.已知a 为锐角,sin a =cos50°,则a等于?3.设a 为锐角,sin a =3 cos a 则cos a*sin a等于?4.1/4*t](/uploads/image/z/3885184-64-4.jpg?t=%E6%B1%82%E6%95%99%E5%88%9D%E4%B8%AD%E9%94%90%E8%A7%92%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%E9%97%AE%E9%A2%98.%E6%B1%82%E5%8A%A9%E5%87%A0%E9%81%93%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%E7%9A%84%E9%A2%98%EF%BC%9A1.%E5%B7%B2%E7%9F%A5sin+a+%2Acos+a+%3D1%2F8+%E4%B8%9445%C2%B0%EF%BC%9C%E2%88%A0a%EF%BC%9C90%C2%B0%2C%E5%88%99cos+a+-sin+a+%E7%9A%84%E5%80%BC%E6%98%AF%3F2.%E5%B7%B2%E7%9F%A5a+%E4%B8%BA%E9%94%90%E8%A7%92%2Csin+a+%3Dcos50%C2%B0%2C%E5%88%99a%E7%AD%89%E4%BA%8E%3F3.%E8%AE%BEa+%E4%B8%BA%E9%94%90%E8%A7%92%2Csin+a+%3D3+cos+a+%E5%88%99cos+a%2Asin+a%E7%AD%89%E4%BA%8E%3F4.1%2F4%2At)
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