Math Is Fun Forum

Foolboy

Member

Registered: 2009-04-26

Posts: 1

PreCal Identities and Formulas

Verify: cos(y+pi)=-cos(y)

I'm completely stumped. I know that there is an identity cos((pi/2)-x)=sinx, but that's the closest I could find...

Also, how do you show work for sec(32°)=csc(58°)? I just did it in the calculator.

coffeeking

Member

Registered: 2007-11-18

Posts: 44

Re: PreCal Identities and Formulas