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7

Part of 1995 Baltic Way

Problems(1)

sin^3(18)+sin^2(18) is one eighth

Source: Baltic Way 1995

10/8/2011
Prove that sin⁡318∘+sin⁡218∘=18\sin^318^{\circ}+\sin^218^{\circ}=\frac18.
trigonometryalgebra proposedalgebra