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Sticky Note
If tan x = 3/5, then cos x = ?
  1. 3/5
  2. 4/5
  3. 5/√34
  4. 5/√34
Explanation

1+tan⁡2x=sec⁡2x1 + tan^2 x = sec^2 x
sec x = √(1 + (3/5)²) = √(34/25) = √34/5
cos x = 1/sec x = 5/√34

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