Without using a calculator, find the exact value of each of the following: a. sin20 cos 70
Question:
Without using a calculator, find the exact value of each of the following:
a. sin20° cos 70° + cos 20° sin70°
b. sin172° cos 37° − cos172° sin37°
c. cos 25° cos 35° − sin25° sin35°
d. cos 99° cos 69° + sin99° sin69°
e.
f.
Transcribed Image Text:
tan 25° + tan 20⁰ 1-tan 25° tan 20⁰
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ANSWER a Using the identity sinAB sinAcosB cosAsinB we have sin20 cos70 cos20 sin70 sin20 70 sin90 1 ...View the full answer
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Related Book For
Cambridge International AS & A Level Mathematics Pure Mathematics 2 & 3 Coursebook
ISBN: 9781108407199
1st Edition
Authors: Sue Pemberton, Julianne Hughes, Julian Gilbey
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