高一数学必修四诱导公式试题,①已知cos(75°+α)=三分之一,其中α为第三象限角,则cos(105°-α)+sin(α-105°)的值是多少?②已知f(θ)=2+2cos²(π+θ)+cos(—θ)分之 2cos³θ+sin²(2
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![高一数学必修四诱导公式试题,①已知cos(75°+α)=三分之一,其中α为第三象限角,则cos(105°-α)+sin(α-105°)的值是多少?②已知f(θ)=2+2cos²(π+θ)+cos(—θ)分之 2cos³θ+sin²(2](/uploads/image/z/1526114-2-4.jpg?t=%E9%AB%98%E4%B8%80%E6%95%B0%E5%AD%A6%E5%BF%85%E4%BF%AE%E5%9B%9B%E8%AF%B1%E5%AF%BC%E5%85%AC%E5%BC%8F%E8%AF%95%E9%A2%98%2C%E2%91%A0%E5%B7%B2%E7%9F%A5cos%EF%BC%8875%C2%B0%2B%CE%B1%EF%BC%89%3D%E4%B8%89%E5%88%86%E4%B9%8B%E4%B8%80%2C%E5%85%B6%E4%B8%AD%CE%B1%E4%B8%BA%E7%AC%AC%E4%B8%89%E8%B1%A1%E9%99%90%E8%A7%92%2C%E5%88%99cos%EF%BC%88105%C2%B0-%CE%B1%EF%BC%89%2Bsin%EF%BC%88%CE%B1-105%C2%B0%EF%BC%89%E7%9A%84%E5%80%BC%E6%98%AF%E5%A4%9A%E5%B0%91%3F%E2%91%A1%E5%B7%B2%E7%9F%A5f%EF%BC%88%CE%B8%EF%BC%89%3D2%2B2cos%26sup2%3B%EF%BC%88%CF%80%2B%CE%B8%EF%BC%89%2Bcos%EF%BC%88%E2%80%94%CE%B8%EF%BC%89%E5%88%86%E4%B9%8B+2cos%26sup3%3B%CE%B8%2Bsin%26sup2%3B%EF%BC%882)
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