Recent content by batterypack

got it, thanks.

I tried to use tex code but it seems to be caching the image on preview, so anyway dy/dx ( x / root x) = 1 / ( 1/2 x^(-1/2) ) however the answer given to me is just ( 1/2 x^(-1/2). What's gone wrong? Spent an hour on this and now unsure if my algebra is wrong. And the tex code that I...

Yes, I meant the sine of 3 or 4 times the angle. Thanks.

Found it, sin 2a = 2 (sin a) (cos a) Can this be generalised further? What if you want to find 3 or 4 times the sine of the angle?

Misunderstood this question: "Suppose you are told that the sine of a certain angle is 0.5299 and the cosine of the same angle is 0.8480. What is the sine of twice this angle. Don't use the trigonomtric functions keys on your calculator to figure this out." I have the answer, but no idea...

sin x = 0.5299 cos x = 0.8480 Without using inverse cos or inverse sin, is it possible to calculate the angle?