Ask your own question, for FREE!
Mathematics
OpenStudy (anonymous):

An equation of the line tangent to the graph of y=cos(2x) at x=π/4 is? Help please?

hero (hero):

Do you have a graphing calculator?

OpenStudy (anonymous):

yes i do

hero (hero):

Hold on for a minute

OpenStudy (anonymous):

okay

hero (hero):

There is a formula for this

OpenStudy (anonymous):

and i have no clue what it is?

hero (hero):

Sorry, it's called Linear Approximation

hero (hero):

y - f(c) = f'(c)(x - c)

hero (hero):

y - f(pi/4) = f'(pi/4)(x - pi/4)

hero (hero):

If you evaluate that, you'll get your answer

OpenStudy (anonymous):

ohhh okay... i knew there was a formula but i didn't know which one... that helps me out a lot thanks so much!

hero (hero):

Make sure if you're using a calculator that you're in radians, not degrees

Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!
Latest Questions
Tonycoolkid21: help
4 hours ago 8 Replies 0 Medals
Tonycoolkid21: help
4 hours ago 15 Replies 3 Medals
crispyrat: A guide to sqrt and cbrt
5 hours ago 21 Replies 3 Medals
xXQuintonXx: help please(ss below)
7 hours ago 5 Replies 1 Medal
rxcklesskaisher: idk wdh dis is
7 hours ago 2 Replies 0 Medals
Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!