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Unformatted text preview: Tuesday February 13th 2001 sin θ = 1 0 ≤ θ <2π
Hint: ANSWER: π 2 sin 2 x + cos x = 0
sin 2 x = 2 sin x cos x 2sin x cos x + cos x = 0
FACTOR SET EQUAL TO ZERO SOLVE cos 2 x + sin x = 0
Which replacement for cos2x will you use?
FACTOR SET EQUAL TO ZERO SOLVE sin 2 x = tan x
LCD METHOD!! 2 cos 2 x = 1 In Closing…..
• HW: pg620: 26,28,29,30,38 • Test on FRIDAY! • Review 10th period Tues, Wed, Thurs Wednesday Feb 14th, 2001 sin 2θ − cosθ = 0 0 ≤ θ <360
o o
ANSWER: o { 30 ,90 ,150 ,270 }
o o Day 1 Trig Equation Review
Go over HW Practice Moving Angles around the circle Regent’s Part II Exam Practice Problems Practice Moving Angles around the Circle.
Find all the angles whose reference angle is 36 degrees. 144 36 180 216 324 180+ 360 Practice Moving Angles around the A solution to your Circle.
problem is –25 degrees and you are working with sine. Find the positive angle answers. S 205 335 T A C Practice Moving Angles around the A solution to your Circle.
problem is 110 degrees and you are working with cosine. Find the positive angle answers. S 205 T 110 A C Part II
2 10 point problem 2 sin x + 2 cos x − 1 = 0 nearest deg ree
What needs to be replaced? What technique will you use to solve this? Part II 10 point problem 3cos 2 x + 2sin x = −1
Nearest Ten Minutes Which formula is most appropriate to use? Part II 10 point problem 3sin x − 2sin x = −1
2
Nearest Ten Minutes Look back at the last three problems and find these three KEY techniques:
Replacing Replacing sin x with 1 − cos x
2 2
2 cos 2 x with 1 − 2sin x Using the Quadratic Formula In Closing…..
• HW: pg 623:714 • Test on FRIDAY! • Review 10th period Tues, Wed, Thurs Thursday 21501 cos 40 cos30 − sin 40 sin 30 =
o o o o
ANSWER: leave as a function of a positive angle. cos 70 o ...
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 Spring '09
 RANJITREBELLO
 Trigonometry, Cos, Harshad number

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