If sin α = 4/5, then cos(2α) is?
PPSC 5 Years Past Papers Subject Wise (Solved with Details) / All — Multiple-choice practice
- A. 2/25
- B. 23/25
- C. 9/25
- D. - 7/25
Correct answer
- 7/25
Explanation
Explanation sin α = 4/5 ⇒ cos α = 3/5 (from Pythagoras) cos(2α) = 2cos²α − 1 = 2*(9/25) − 1 = 18/25 − 25/25 = −7/25
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