Math, asked by swatipani2005, 7 months ago

prove that,sin⁴A- cos⁴A = 2sin²A-1

Answers

Answered by ishagera1212

0

Step-by-step explanation:

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Answered by padmavathinandam

0

Answer:

2sin^2A-1

Step-by-step explanation:

(sin^2A)^2-(cos^2A) ^2

using a^2-b^2=(a+b) (a-b)

(sin^2A+cos^2A) (sin^2A-cos^2A)

sin^2A+cos^2A=1

1((sin^2A-cos^2A)

sin^2A-(1-sin^2A)

sin^2A-1+sin^2A

2sin^2A-1

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