If y = x sinx Then y/ at x = 90º equal
(a) 0
(b) –1
(c) 2
(d) 1 *
how can i get this answer?
The answer is (d) only if
y = sinx
since sin 90º = 1
or, if you want to evaluate y/x at x=90º
90º = π/2 radians, so
x sinx at x = π/2 is π/2
divide by π/2 to get 1