Question

cos⁴A - sin⁴A is equal to ???​

Answer 1

Answer:

cos2A

hope this will help you

Answer 2

$\huge\bold\blue{Question,}$,

cos4A - sin4A = ?

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$\huge\underline{\mathbb\red{❥︎A}\green{N}\mathbb\blue{S}\purple{W}\mathbb\orange{E}\pink{R}}\:$,

[cos2A ]2 - [ sin2A]2

=>( cos2A + sin2A ) ( cos2A - sin2A )

=> 1 × [ cos2A - sin2A ]

=> cos2A - sin2 A ans.