Question

find dy/dx

Answer 1

y=sec^2x-tan^2x

Answer 2

and also:
y=sint and x=cost

Answer 3

y=sec^2x-tan^2x
use, sec^2 x = 1+ tan^2 x

Answer 4

y=sint and x=cost
square and add them, what you get ?
hint : sin^2 t+ cos^2 t=1

Answer 5

Thank you!

Answer 6

welcome ^_^

Answer 7

ask if any doubts ...or want to verify your answer..