Express the following as trigonometric ratios of either 30, 45 or 60, and hence find their exact
Question:
Express the following as trigonometric ratios of either 30°, 45° or 60°, and hence find their exact values.
a. sin 135°
b. sin (−60°)
c. sin 330°
d. sin 420°
e. sin (−300°)
f. cos 120°
g. cos 300°
h. cos 225°
i. cos (−210°)
j. cos 495°
k. tan 135°
l. tan (−225°)
m. tan 210°
n. tan 300°
o. tan (−120°)
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Step by Step Answer:
a sin 135 We know that sin 45 22 and sin 90 1 Since 135 is the sum of 45 and 90 we can use the sumofangles formula for sine sin 135 sin45 90 sin 45 cos 90 cos 45 sin 90 Substituting the values sin 135 ...View the full answer
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Related Book For 
Edexcel AS And A Level Mathematics Pure Mathematics Year 1/AS
ISBN: 9781292183398
1st Edition
Authors: Greg Attwood
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