More questions on - finding dy/dx

Question

1) y = sqrt 4 + sin 10 x - I am lost again

2) y = 10/sin x

answer: - 10 csc x cot x

3) y = sin x/ 8x

Answer 1

1) can't decide what is under the square root, use brackets
the way it stands, dy/dx = 0 + 10cosx
(looks too easy)

2) correct

3) use quotient rule

dy/dx = (8x(cosx) - 8sinx)/(64x^2)

take it from there

Answer 2

y = sqrt (4 + sin 10x)