Calling All Brainy Mathematicians..

heeeey :P lol!
just wondering if u can help me prove this que:

tan2xsecx=2sinxsec2x
so far ive got:

(2tanx/1-tan²x)(1/cosx)=2sinx(1/cos2x)

now wat? :eek:

Reply 1

-G-a-v-

To prove any identity, start with one side and work your way logically to the other. Don't try to simplify both sides.

Reply 2

Gaz031

Try writing tan2x=sin2xsec2x and proceeding from there.

Reply 3

username9816

Fizzle

prove: tan2xsecx = 2sinxsec2x

tan2x.secx = sin2x/(cos2x.cosx) = (2sinxcosx)/(cos2xcosx) = 2sinx/(cos2x) = 2sinx.sec2x

Reply 4

Jonny W

tan(2x)sec(x)
= sin(2x)sec(x)sec(2x)
= 2sin(x)cos(x)sec(x)sec(2x)
= 2sin(x)sec(2x)

Reply 5

Icy Ghost

Reply 6

Fizzle

thanksss guys! makes sense now :smile:

much much much MUCHHH appreciated!!!

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