Use of identities.

[Azmain S. Raiyan]

If,
cos⁴A/cos²B+sin⁴A/sin²B=1

Then prove that,
cos⁴B/cos²A+sin⁴B/sin²A=1

 

[Deleted member 4993]

If,
cos⁴A/cos²B+sin⁴A/sin²B=1

Then prove that,
cos⁴B/cos²A+sin⁴B/sin²A=1

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[Azmain S. Raiyan]

Alrighty