Review the following concepts if needed:
 Conversion from Degrees to Radians Help
 Coterminal and Reference Angles Help
 Trigonometric Functions Help
 Graphing Sine and Cosine Help
 Graphs of Other Trigonometric Functions Help
 Right Triangle Trigonometry Help
 Inverse Trigonometic Functions Help
 Law of Sines and Cosines Help
 Miscellaneous Trigonometric Formulas Help
Trigonometry Practice Test
Practice

Find sin θ if cos and θ is in Quadrant II.

What is the phase shift for f ( x ) = 2 cos(3 x + π /2)?

What is the period for f ( x ) = 2 cos(3 x + π /2)?

From the top of a 200foot lighthouse, the angle of depression to a ship on the ocean is 20°. How far is the ship from the base of the lighthouse?
(a) About 400 feet
(b) About 490 feet
(c) About 550 feet
(d) About 690 feet

cos 15° cos 10° + sin 15° sin 10° =
(a) cos 5°
(b) cos 25°
(c) sin 5°
(d) sin 25°

Find the reference angle for 7 π /9.

The terminal point for θ is (−3/5, 4/5). What is tan θ ?

tan(cos ^{− 1} 3/4) =

The graph in Figure 13.62 is the graph of one period of which function?
(a) y = 2cos( x + π /3)
(b) y = 2cos( x − π /3)
(c) y = cos2( x + π /3)
(d) y = cos2( x − π /3)

The graph in Figure 13.63 in the graph of one period of which function?

Find A .
(a) About 68.2°
(b) About 21.8°
(c) About 66.4°
(d) About 23.6°
Solutions
 A
 C
 A
 C
 A
 A
 A
 B
 B
 A
 D
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