Question

Find x coordinate from the curve with equation y = e^-xsinx which has one stationary point.

Answer 1

dy/dx = -e^xsinx + e^-x cos x

Answer 2

Then dy/dx = 0

Answer 3

dont forget the -x on the first one too

Answer 4

Yeah yeah my mistake

Answer 5

So how Do you find x?

Answer 6

ok do you know what a stationary point is first

Answer 7

Yeahh, Erm I just can't find x.

Answer 8

its actually same as sin x i think

Answer 9

HUH?

Answer 10

because this is called an enveloped sin x, basically the sinx curve is exponentially decaying