SOLUTION: Prove that the following equations is an Identity (1- tanA)^2= sec^2A-2tanA

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Question 519689: Prove that the following equations is an Identity
(1- tanA)^2= sec^2A-2tanA
Answer by lwsshak3(11628) About Me  (Show Source):
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Prove that the following equations is an Identity
(1- tanA)^2= sec^2A-2tanA
**
starting with left side
(1-tan)^2=1-2tan+tan^2
identity: sec^2=tan^2+1
1-2tan+tan^2=sec^2-2tan
verified: left side=right side