Math, asked by akramulislam1609, 6 months ago

how 1- 2sin²A=2cos²-1

Answers

Answered by Haritendra

3

Answer:

L. H. S. = 1-2sin^2 A

from sin^2A+cos^2A=1

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

= 1-2+2cos^2A

= 2cos^2A-1

= R. H. S.

Q. E. D.

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