这个三角函数化简的答案是不是错了..{[sin(π/2+α)乘cos(π/2-α)] /[cos(π+α)]} + {[sin(π-α)乘cos(π/2+α)] /[sin(π+α)]}我化简成了cosα-sinα 但答案给的却是0 .麻烦高手解答下我是那里算错了,能给出步骤
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![这个三角函数化简的答案是不是错了..{[sin(π/2+α)乘cos(π/2-α)] /[cos(π+α)]} + {[sin(π-α)乘cos(π/2+α)] /[sin(π+α)]}我化简成了cosα-sinα 但答案给的却是0 .麻烦高手解答下我是那里算错了,能给出步骤](/uploads/image/z/12553629-69-9.jpg?t=%E8%BF%99%E4%B8%AA%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%E5%8C%96%E7%AE%80%E7%9A%84%E7%AD%94%E6%A1%88%E6%98%AF%E4%B8%8D%E6%98%AF%E9%94%99%E4%BA%86..%7B%5Bsin%28%CF%80%2F2%2B%CE%B1%29%E4%B9%98cos%28%CF%80%2F2-%CE%B1%29%5D+%2F%5Bcos%28%CF%80%2B%CE%B1%29%5D%7D+%2B+%7B%5Bsin%28%CF%80-%CE%B1%29%E4%B9%98cos%28%CF%80%2F2%2B%CE%B1%29%5D+%2F%5Bsin%28%CF%80%2B%CE%B1%29%5D%7D%E6%88%91%E5%8C%96%E7%AE%80%E6%88%90%E4%BA%86cos%CE%B1-sin%CE%B1+%E4%BD%86%E7%AD%94%E6%A1%88%E7%BB%99%E7%9A%84%E5%8D%B4%E6%98%AF0+.%E9%BA%BB%E7%83%A6%E9%AB%98%E6%89%8B%E8%A7%A3%E7%AD%94%E4%B8%8B%E6%88%91%E6%98%AF%E9%82%A3%E9%87%8C%E7%AE%97%E9%94%99%E4%BA%86%2C%E8%83%BD%E7%BB%99%E5%87%BA%E6%AD%A5%E9%AA%A4)
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