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## Homework Statement

Use the given triangle to prove that for 0 < X <90, 1 + tan^2X = 1 / cos^2X

(the given triangle is right angled with angle X marked. The hypotenuse is labeled c, adjacent angle is labeled a and the opposite angle is labeled b)

## The Attempt at a Solution

I have no idea where to begin,

tanX = b/a

cosX = a/c