Math, asked by sohambakane394svb, 10 months ago

prove that cos2A = cos^2A - sin^2A

Answers

Answered by raju35652

1

Step-by-step explanation:

formula:

cos(A+B)=cosAcosB-sinAsinB

if A=B

cos(A+A)= cosAcosA-sinA-sinA

cos2A= cos²A-sin²A

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