Question

cos ki power 4 -cos square a=sin ki power 4 - sin square a

Answer 1

Answer:

Step-by-step explanation:

cos⁴A-cos²A=sin⁴A-sin²A

L.H.S

(cos²A)²-cos²A

(1-sin²A)²-cos²A                               (cos²A=1-sin²A)

1+sin⁴A-2sin²A-(1-sin²A)

1+sin⁴A-2sin²A-1+sin²A

sin⁴A-sin²A

L.H.S=R.H.S

Hence prooved.

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