Download cofunctions(4) work.notebook

cofunctions(4) work.notebook
Do Now: Check HW answers and ask questions! Pg 414
and do the following problems!!!! Get calculator!
Do Now:
Cofunctions:
Guess what the cofunction is for:
1) sin x
2) tan x
3) sec x
cofunctions(4) work.notebook
Cofunction Identities
sin x = cos (90o ­ x) cos x = sin (90o ­ x)
tan x = cot (90o ­ x) cot x = tan (90o ­ x)
sec x = csc (90o ­ x) csc x = sec (90o ­ x) a) Rewrite each function in terms of its cofunction
b) Find, to four decimal places, the value of the function in part a.
2) sin 86
1) cos 80
3) sec 75
4) tan 54
What mode should your calculator be in?
cofunctions(4) work.notebook
5) sec 125
6) cos 255
7) sin 295
8) sec 285
a) Rewrite each function value in terms of its cofunction.
b) Find the exact value of the function value in part a.
1) sin π/3
2) tan π/6
3) csc 5π/6
4) tan (­ 5π/3)
a) cot (π/2 ‐ (‐ 5π/3))
cot (π/2 + 5π/3)
cot (13π/6)
b)
cot 390
cot 30
_
√3
cofunctions(4) work.notebook
Homework: Pg 427 # 3 ­ 33 odd
and
Pg 430 # 1 ­ 18, 20 ­ 33 all
Study for Test:
1) Arc length formula
2) Change degrees to radians
3) Change radians to degrees
4) Remaining trig values (Homework we went over today)
5) Trig 1­2­3 with radian measures
6) Factoring
7) Pythagorean Identities
8) Cofunction Identities
9) Intersection of unit circle and angle in standard position
10) Function Notation
11) Inverse Trig values in 1st quadrant rounded to a decimal
Due Thursday also: Pg 430 # 1 ­ 33 odd and 18, omit 19,