化简sinacosa(tana+cota)
化简sinacosa(tana+cota)
如何化简,具体说明.
如何化简,具体说明.
其他人气：774 ℃时间：2020-05-12 10:23:22
优质解答
⑴sinacosa(tana+cota)=sinacosa（sina/cosa+cosa/sina）=sinacosa*sina/cosa+sinacosa*cosa/sina=sin^2a+cos^2a=1⑵cot^2a(tan^2a-sin^2a)=cot^2a*tan^2a-cot^2a*sin^2a=1-cos^2a*sin^2a/sin^2a=1-cos^2a=sin^2a...
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