Find the exact value. Find cos 2 theta y=20 r=29 x=21

Darryl English 2022-07-26 Answered
Find the exact value.
Find cos 2 θ
y=20 r=29 x=21
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Answers (1)

Tamoni5e
Answered 2022-07-27 Author has 14 answers
θ = cos 1 ( 21 / 29 )
Trig identity:
cos 2 θ = 2 cos 2 ( θ ) 1
2 cos 2 ( cos 1 ( 21 / 29 ) ) 1 = 2 ( 21 / 29 ) 2 1 = 41 / 841
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