Question

(-cos^2xtanx)/(sinx)=-cosx

Answer 1

What? You're supposed to prove this is true?

Answer 2

yes, and I need help!

Answer 3

Try replacing tan with sin/cos and see where that leads.

Answer 4

Okay, Ill try it.

Answer 5

Im stuck at -(1-sin^2x)( sin/cos)/sinx

Answer 6

No. Leave the -cos^2 alone. Then you can cancel.

Answer 7

Okay, I did that and i was left with (-cosxsinx)/sinx. So then the sins cancel out?

Answer 8

yes.

Answer 9

Good job.

Answer 10

Okay, thank you so much! That helped a lot.

Answer 11

yw