1. Lesson: Derivative Techniques 2
Obj - Derivatives of Trig Functions

2. Trig Essentials SOHCAHTOA

3. Now, let’s examine the trig function graphs

8. Practice!

9. Other trig values

11. Basic Trig Identities

12. Trig Derivative Equations:1. 2.

13. Proof that
First, a couple of common limits you should know:
And who could forget our friend, the difference quotient:

16. Proof that
First, a couple of common limits you should know:
And who could forget our friend, the difference quotient:

19. What about Tangent, Cotangent, Secant, and Cosecant?
Let’s derive them!
Use quotient rule:

21. Therefore,

22. Now try:

23. So, 2. 4.

24. O.K., How do I remember all that?
Look at the cofunctions
The derivative of any cofunction
can be obtained from the derivative
of the corresponding function by
taking the negation and replacing
each function in the derivative with
its cofunction.

25. EX. 1: Find dy/dx if

26. EX. 2: Find dy/dx if

27. EX.3 : Find

28. EX. 4: Find