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If cos x=t a n x , then which of the f...

If `cos x=t a n x ,` then which of the following is true? (a)`1/(sinx)+cos^4x=1` (b) `1/(sinx)+cos^4x=2` (c) `cos^(54)x+cos^2x=1` (d)`cos^4x+cos^2x=2`

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