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सिद्ध कीजिए निम्नलिखित व्यंजक theta पर न...

सिद्ध कीजिए निम्नलिखित व्यंजक `theta` पर निर्भर करते |
`cos^(2)theta+cos^(2)(alpha+theta)-2cos theta cos alpha cos(theta+alpha)`

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