急求两道高三数学题的解法!1.定义在R上的周期函数f(x),其周期为T=2,且f(x)在[—2,—1]上是减函数,若A、B是锐角三角形的两个内角,则( )A、f(sinA)>f(cosB) B、 f(cosB)>f(sinB) C 、f(sinA)>f(sinB) D
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![急求两道高三数学题的解法!1.定义在R上的周期函数f(x),其周期为T=2,且f(x)在[—2,—1]上是减函数,若A、B是锐角三角形的两个内角,则( )A、f(sinA)>f(cosB) B、 f(cosB)>f(sinB) C 、f(sinA)>f(sinB) D](/uploads/image/z/12582696-48-6.jpg?t=%E6%80%A5%E6%B1%82%E4%B8%A4%E9%81%93%E9%AB%98%E4%B8%89%E6%95%B0%E5%AD%A6%E9%A2%98%E7%9A%84%E8%A7%A3%E6%B3%95%211%EF%BC%8E%E5%AE%9A%E4%B9%89%E5%9C%A8R%E4%B8%8A%E7%9A%84%E5%91%A8%E6%9C%9F%E5%87%BD%E6%95%B0f%28x%29%2C%E5%85%B6%E5%91%A8%E6%9C%9F%E4%B8%BAT%3D2%2C%E4%B8%94f%28x%29%E5%9C%A8%5B%E2%80%942%2C%E2%80%941%5D%E4%B8%8A%E6%98%AF%E5%87%8F%E5%87%BD%E6%95%B0%2C%E8%8B%A5A%E3%80%81B%E6%98%AF%E9%94%90%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2%E7%9A%84%E4%B8%A4%E4%B8%AA%E5%86%85%E8%A7%92%2C%E5%88%99%EF%BC%88++%EF%BC%89A%E3%80%81f%28sinA%29%3Ef%28cosB%29+++B%E3%80%81+f%28cosB%29%3Ef%28sinB%29++C+%E3%80%81f%28sinA%29%3Ef%28sinB%29+++D)
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