Thread: Simplifying trig expression

Hi
A few question i am stuck on and need help:
1)
this is what i have done but it is incorrect.




2)

3)

P.S

not sure what you want to simplify the expression to. im just guessing,

1) following on,
sin2a

2) (1/2)sinxcosx = 1/4(2sinxcosx) = (1/4)sin2a

3) tanx/(1-tan^2x) = 1/2[(2tanx)/(1-tan^2x)] = 1/2tan2x

Originally Posted by differentiate

not sure what you want to simplify the expression to. im just guessing,

1) following on,
sin2a

2) (1/2)sinxcosx = 1/4(2sinxcosx) = (1/4)sin2a

3) tanx/(1-tan^2x) = 1/2[(2tanx)/(1-tan^2x)] = 1/2tan2x

yeh, thanks that makes sense now.