given that π/2 ≤ θ ≤ 3π/2 and sin θ = -2/7 find sin(θ+π/4)

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- December 7th 2012, 05:59 AMabsolutjessyFind sin(theta + pi/4) I'm confused?
given that π/2 ≤ θ ≤ 3π/2 and sin θ = -2/7 find sin(θ+π/4)

- December 7th 2012, 09:10 AMcoolgeRe: Find sin(theta + pi/4)
use sin(A+B) = sinAcosB + cosAsinB and

cosA = sqrt(1-sin^2(A))