Describe the concavity of the graph off(x)=x^2-sin(2x)

on the interval[0,]

concave up on(0,7/12); concave down on(7/12,)

.

b)concave up on(0,7/12)

and on(11/12,)

; concave down on(7/12,11/12)

.

c)concave up on(7

12,11/12)

; concave down on(0,7/12)

and on(11/12,)

.

d)concave down on(0,)

.

e)concave up on(0,/12)

; concave down on(/12,)

.