Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
Problem 1CT
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Topic Video
Question
Transcribed Image Text:(1+cos2x)
EX/Show that cosx=.
Sol/
cos 2x cos(x +x) = cos x.cos x-sin x.sin x
= cosx-sinrcos x-(1-cos' x)=2 cos x-1
cos
1+ cos 2x
r%3D
2
HW:
) Prove that:
cos e
(a)
1- tan e 1-cot? 0
sin 0
2-
=1, (b) tan2 0.cos 0 + cot? 0.sin? 0 = 1
From the figure below find (a) sin (60), (b) cos (60),
(c) sin (30),=
2
しこ。
Sin=
(d) cos (30), (e) |AD|
し
2.
ton =
B 660
| 60c
From the figure below find cos (45)
%3D
J45
9°
3
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