Inverse Trig Functions & Derivatives of Trig Functions
Inverse Trig Functions & Derivatives of Trig Functions
Cole Zmurchok Math 102 Section 106
November 28, 2016
Today...
1. More Trig Function Derivatives 2. Inverse Trig Functions 3. Related Rates with Trig Functions
Course Evaluations: do these for all of your courses! Let me know if you need the website. WW 12 due Thursday Final Exam: Dec 12, 8:30 am
Warm-up
Q1. What is the period, T , of h(t) = 8 - 6 sin(4t)? A. T = 4 B. T = 1/4 C. T = 1 D. T = 2 E. T = /2
Warm-up
Q2. What is the amplitude of h(t) = 8 - 6 sin(4t)? A. 14 B. 8 C. 12 D. 6 E. -6
Warm-up
Q3. What is the derivative of tan(ex2)? A. sec2(ex2) B. sec2(ex2)ex2 C. sec2(ex2)ex2x2 D. sec2(ex2)ex22x E. sec2(ex2)ex2x22x
Derivatives of Trigonometric Functions
We already know that
d dx
sin
x
=
cos
x
d dx
cos
x
=
-
sin
x
We used the quotient rule to find
d
d
tan x =
sin x = sec2 x
dx
dx cos x
Derivatives of Trigonometric Functions
What is the derivative of cot(x)?
d
d cos x
cot x =
dx
dx sin x
- sin x sin x - cos x cos x
=
sin2 x
-1 = sin2 x
= - csc2 x
Inverse Trigonometric Functions
f (x) = sin x Inverse Trfig-o1n(oxm)e=tricafrucnscintio(nxs) "the angle whose sine is x"
1
x
1-x2
Figure 1T4.1h0e. Tahbiosvtreiatnrgialenhgalsebiesencocnonssttrruucctteeddsosothatht atis an angle wh 1 = x. This msienans =thaxt = arcsin(x)
This means that = arcsin x
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