SOLUTION: I don't understand how to work these types of problems: Sec^2 18 degrees - tan^2 18 degrees. Thanks!

SOLUTION: I don't understand how to work these types of problems: Sec^2 18 degrees - tan^2 18 degrees. Thanks!

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Question 415076: I don't understand how to work these types of problems:
Sec^2 18 degrees - tan^2 18 degrees.
Thanks!
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
There is a variant of the Pythagorean identity: . Hence , and so
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