SOLUTION: Verify following is an identity. cos(A+B)=(1-(tanA)(tanB)/(secA)(secB)

SOLUTION: Verify following is an identity. cos(A+B)=(1-(tanA)(tanB)/(secA)(secB)

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Question 398075: Verify following is an identity.
cos(A+B)=(1-(tanA)(tanB)/(secA)(secB)
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!

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