Question 1192730
How does one prove the following identity:

9sec^2θ - 5tan^2θ  = 5 + 4sec^2θ 
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5sec^2 = 5tan^2 + 5
sec^2 = tan^2 + 1
QED
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If you want, multiply thru by cos^2
---> 1 = sin^2 + cos^2 the Pythagorean identity.
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PS  I wouldn't call 9sec^2θ - 5tan^2θ  = 5 + 4sec^2θ an identity.
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Edwin, I don't consider that to be an identity.