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If tanA=n×tanB and sinA=m×sinB,then prove that …

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If tanA=n×tanB and sinA=m×sinB,then prove that cos×cosA=m×m-1÷n×n-1.??????

    • Posted by Hitesh Yadav 7 years, 11 months ago

    CBSE > Class 09 > Mathematics
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