SOLUTION: simplify the expression sin^2X-1/cos(-x)

Algebra ->  Trigonometry-basics -> SOLUTION: simplify the expression sin^2X-1/cos(-x)      Log On


   

Question 766932: simplify the expression
sin^2X-1/cos(-x)
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
simplify the expression
[sin^2(X)-1]/cos(-x)
---
Snce sin^2+cos^2 = 1
------
= -cos^2(x)/cos(x)
---
= -cos(x)
===============
Cheers,
Stan H.