Posted by **Alycia** on Thursday, November 1, 2012 at 9:42pm.

Im really struggling with these proving identities problems can somebody please show me how to do these? I'm only aloud to manipulate one side of the equation and it has to equal the other side of the equation at the end

Problem 1. (1-tanx) = (cosx-sinx)/cosx

Problem 2. (secx+tanx)/(cscx-cotx) - (secx-tanx)/(cscx+cotx) = 2(secx+cscx)

- Math -
**bobpursley**, Thursday, November 1, 2012 at 9:49pm
a. multipy the left side by cos/cos, you get

(cos-sin)/cos

b. on the left, get a common denominator

(csc^2-ctn^2)

then combine both terms into one fraction. It reduces rapidaly. If you get stuck convert all terms to sin, cos)

- Math -
**Alycia**, Thursday, November 1, 2012 at 9:53pm
Thanks! I feel stupid now that I didn't see tht before, but I appreciate your help

- Math -
**Lulu **, Monday, April 22, 2013 at 6:53pm
A pizza restaurant sold 275 veggie pizzas. It sold 71 more pepperoni pizzas than veggie pizzas. If each pizza cost $9,how much did the restaurant earn?

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