prove that identity cos square theta + tan square theta / sin square theta= tan square theta
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=cos^20+tan^20/sin^20
=cos^20+sin^20/cos^20/sin^20
=1/cos^20/sin^20
=sin^20/cos^20
=tan^20
we place in place of theta 0
=cos^20+sin^20/cos^20/sin^20
=1/cos^20/sin^20
=sin^20/cos^20
=tan^20
we place in place of theta 0
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