I am having a bit of trouble with proving these 2 identities. Normally, i can figure these out. there is no solution in the back of the book so here i am.
first identity
what i have come up with is this. which i know is totally wrong.
the next identity
thats all i have, and i dont think its correct! i know sec^2(t) = tan^2(t) + 1 but i dont know if that plays any role here?
Any help is much appreciated because i have tried everything i could think of and i cant solve these two problems.
first identity
Code:
1 - cos(2t) / cos(t)sin(t) = 2 tan(t)
what i have come up with is this. which i know is totally wrong.
Code:
1 - cos(2t) / cos(t)sin(t) = 2 tan(t)
= 1 - 2 cos^2(t) - 1 / cos(t) sin(t) // because cos(2t) = 2cos^2(theta) -1 ???
= Now, i am not sure what to do because for it to be tan it needs to be sint/ cost
and thats not possible! =(
the next identity
Code:
1 / 1 - sin(t) + 1 / 1 + sin(t) = 2sec^2(t)
Code:
1 / 1 - sin(t) + 1 / 1 + sin(t) = 2sec^2(t)
use conjugate?
= 1 + sin(t) / 1 - sin(t) + 1 - sin(t) / 1 + sin(t)
= 2 - sin(t) / 1+ sin(t) - sin(t) - sin(t) // distributing the bottom
thats all i have, and i dont think its correct! i know sec^2(t) = tan^2(t) + 1 but i dont know if that plays any role here?
Any help is much appreciated because i have tried everything i could think of and i cant solve these two problems.