Question

calc medal(:

Answer 1

@phi can you lpease explain?

Answer 2

do you know how to find the derivative of 3 cos(x) ?

Answer 3

3-sinx

Answer 4

I hope you mean 3 * d/dx cos(x) = 3 * -sin(x) = -3 sin(x)

Answer 5

oh oops

Answer 6

yes

Answer 7

sec(x) is 1/cos(x) which is (cos(x))^-1 (i.e to the -1 power). use the exponent rule

Answer 8

-3sin(x)+sec(x)tan(x)

Answer 9

it looks like you picked an answer. The derivative does give that, but you have to play with the trig to get that form

Answer 10

okk

Answer 11

but dont i need the derivative to answer it? @phi

Answer 12

you found y' above
-3sin(x)+sec(x)tan(x)

Answer 13

ohhh

Answer 14

sorry i jumped ahead lol

Answer 15

can you explain the rest of the steps?

Answer 16

what steps?
I only see find y' if y=3cos(x)+sec(x)
and you already did that...

Answer 17

ph o thought phi said i was wrong

Answer 18

nevermind hahah

Answer 19

he said the derivative does give that
as far as the form part he was talking about i think instead of memorizing the derivative of sec(x) he was talking about finding the derivative of (cos(x))^(-1)