If sint = 4/5 and t is in the first quadrant, find cos(2 t) -7/25 -9/25 7/25 24/25 None of these

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 48E
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If sint = 4/5 and tis in the first quadrant, find cos(2 t)
-7/25
-9/25
7/25
24/25
None of these
Transcribed Image Text:If sint = 4/5 and tis in the first quadrant, find cos(2 t) -7/25 -9/25 7/25 24/25 None of these
Find all solutions in [0, 2π): 2 sin (x) — sin (2x) = 0:
0, π
4,4
K+
4
Transcribed Image Text:Find all solutions in [0, 2π): 2 sin (x) — sin (2x) = 0: 0, π 4,4 K+ 4
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