Homework Statement
Differentiate the following
cos^2 x
The Attempt at a Solution
\frac{d(cos^2 x)}{dx}
= 2 (-sin^{2-1} x).\frac{dx}{dx}
= 2 (-sin x).1
= -2 sin x
But the answer given is-
-2 cos x sin x
Can you please tell me what's wrong !
Homework Statement
A ball falls on the surface from 10m height and rebounds to 2.5m.If duration of contact with floor is 0.01 sec,then average acceleration during contact is-
g = 10m/s^2
Homework Equations
\alpha = \frac{v_2 + v_1}{t}
The Attempt at a Solution
Now here
v_{1}...