If tan theta=n tan phi and sin theta=m sin phi then prove that cos^(2)

1.	If tan theta=n tan phi and sin theta=m sin phi then prove that cos^(2)theta=(m^(2)-1)/(n^(2)-1)
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If tan theta=n tan phi and sin theta=m sin phi then prove that cos^(2)theta=(m^(2)-1)/(n^(2)-1)

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If tan theta=n tan phi and sin theta=m sin phi then prove that cos^(2)theta=(m^(2)-1)/(n^(2)-1)​

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If tan theta=n tan phi and sin theta=m sin phi then prove that cos^(2)theta=(m^(2)-1)/(n^(2)-1)