trig-identities worksheet: cosx(secx-cosx)

[tpearce14]

I have gotten a worksheet with trig identity problems and I don't understand some of them. For example, one of the problems is cosx(secx-cosx). Please help me! I need to be able to do these problems to pass my class!

 

[stapel]

I have gotten a worksheet with trig identity problems and I don't understand some of them. For example, one of the problems is cosx(secx-cosx).

Since this is not an equation, it is not an identity, and cannot be "proven". Lacking instructions or any other information, there is nothing to "do" here. Sorry.

Please contact your instructor regarding the missing information. Thank you!

 

[Quaid]

trig identity problems

one of the problems is cosx(secx-cosx)

Hi Pearce:

Maybe you've misunderstood the instructions.

That is, maybe this is not a trig-identity problem, but rather a simplification-using-trig-identities problem.

Double-check the instruction that came with this exercise.

By applying two elementary identities with some algebra, the expression cos(x)*[sec(x) - cos(x)] simplifies to the square of a basic trig function.

Cheers :cool: