Question

If cos² A - sin² A= 1/3 ,then the value of cos to the power 4 - sin to the power 4 A is....

Answer 1

Answer:

1/3

Step-by-step explanation:

cos²A - sin²A = 1/3

(cos²A - sin²A)(cos²A+sin²A) = cos⁴A-sin⁴A

1/3(1) = cos⁴A-sin⁴A [ Since the value of cos²A+sin²A = 1 { Identity} ]

cos⁴A - sin⁴A = 1/3

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