1、用sin(x)2+cos(x)2=1替代sin(x),然后求解
2、两边同时用二倍角公式可得：2cos(2x)=1+sin(2x),通过（cos2x)的平方等于1-sin(2x)的平方转换,最后可以得到结果
cos(x)=1 +sin(x)cos(x)
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