Question

what does sin^2t =?
In relation to trigonometric functions.

Answer 1

Supposedly it equals 1-cos2t/2 but I don't understand why.

Answer 2

oh it's just a trig identity i think.

Answer 3

yes it is...do u know cos(A+B)=cosAcosB-sinAsinB? u will need to use that...

Answer 4

yeah Sin(A+B) = SinACosB + CosASinB

Answer 5

so cos2t=cos(t+t)=....?

Answer 6

You will use here the double angle identity.
Wherein
cos2t = 1-2sin^2 t
Hence,
2sin^2 = 1 - cos^2 t
hence
sin^2 t = (1 - cos^2 t)/2

Answer 7

super it would be cosTcosY - sinTsinY