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What is the answer with steps

What is the answer with steps
asked 166k views
19 votes
What is the answer with steps

What is the answer with steps-example-1
asked
User Pandurang Yachwad
by
8.4k points

1 Answer

10 votes
cos(2θ) = cos²θ - sin²θ = (1-sin²θ)-sin²θ = 1-2(7/9)^2 = -17/81
answered
User Josh Birdwell
by
8.2k points
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