Asked by george

let sin theta = -7/25 with theta in QIV find sec (2theta)
Answered by Reiny
if sinØ = -7/25 in IV, then
cosØ = +24/25

sec 2Ø = 1/cos 2Ø
= 1/(cos^ Ø - sin^2 ‚
= 1/(576/625 - 49/625)
= 625/527
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