I need solve for 18 question for

Calculus 3

with full steps please

Question

i need solve for 18 question for Calculus 3 1 x 9)sec cos 1 sec sec 1 6 x / 6 1
1 1 ,
as
x 0
and
cos
x sec x 6 6 sec sec 1 , as sec sec 1 x x x x 10)Let sin 1 x
x
x2 t sin t cos t 1 sin 2 t 1 2
2
4 4 x2
2 1 x 4 x2
Hence cos sin cos t 2 2…
Math