Question

What basic trigonometric identity would you use to verify that sinx cosx tanx=1-cos^2x

Answer 1

@burgandy
Hint 1:- tanx = sinx/cosx
HInt2 :- sin^2x+cos^2x = 1

Answer 2

would it be sinx=cosx tanx?

Answer 3

http://www.math.com/tables/trig/identities.htm try this

Answer 4

Change the tanx to be in terms of sin and cos... can you do that? @burgandy

Answer 5

I can't. :(

Answer 6

\[sinx*cosx*\frac{ sinx }{ cosx }\]
u can cancel cosx
so u will get sinx*sinx
which is sin^2x

Answer 7

\[tanx = \frac{ sinx }{ cosx }\]

Answer 8

You guys are lifesavers! :)