given that π/2 ≤ θ ≤ 3π/2 and sin θ = -2/7 find sin(θ+π/4)
Last edited by absolutjessy; Dec 7th 2012 at 06:06 AM.
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use sin(A+B) = sinAcosB + cosAsinB and cosA = sqrt(1-sin^2(A))
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