Please take your time and solve them with a clear cut explanation that is easy to understand.

1). If y= 2sinx - cosx, find y'' at x = /3

2). If y= 2cosx + sin 2x, find y" at x= /2

3). Find the slope of the tangent to the curve y= 4sin³2x at x=/6

4). If y= cos2x/4 , find y" at x=

5). If y= cos²x. find y'' at x=/2

6). If y= sin3x/9, find y'' at x=/6

7). If y= 1/sinx , find y'' at x=/2

8). If y= sin²x, find y'' at x=0