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If cos^4x/cos^2y+sin^4x/sin^2y=1 then pr...

If `cos^4x/cos^2y+sin^4x/sin^2y=1` then prove that `cos^4y/cos^2x+sin^4y/sin^2x=1`

A

2

B

0

C

1

D

`-1.`

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C
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MODERN PUBLICATION-TRIGONOMETRIC RATIOS, IDENTITIES AND EQUATIONS-MULTIPLE CHOICE QUESTION(LEVEL-II)
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