Prove sec^2A+tan^2A*sec^2A=sec^4.

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Hi Tony -Trig identities can be tricky sometimes, but the key to proving them is DON'T GIVE UP!  Try several ways to attack the problem.For this problem, I always like to factor out any like terms:Now, you should recognize the following from the main trig identities:So, now substitute into the above equation:Hope that helped