Question

sin2θ / 1 + cos2θ = tanθ

Answer 1

prove this identity?

Answer 2

yes

Answer 3

sin 2x 2sinxcosx
--------- = ---------
1 + cos2x 1 + (2cos^2 x - 1)

= 2sinxcosx sin x
-------- = -----
2cos^2x cos x

Answer 4

can you finish this?

Answer 5

(i used x instead of theta)

Answer 6

No I can't, I'm really confused when it comes to this :S

Answer 7

tan x = sin x / cos x

Answer 8

to do these you need a good knowledge of trigonometrical identities

Answer 9

http://www.sosmath.com/trig/Trig5/trig5/trig5.html

Answer 10

Thank you :)

Answer 11

yw