Photos 2SIN Π X

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2sin π x. Sin (π/2 – x) = sin (–(π/4)). Sin^2*π/4. Sin 2x = π/4. Sin ( x + π 4 ).
Sin (π/2 – x) = sin (–(π/4)). Sin^2*π/4. Sin 2x = π/4. Sin ( x + π 4 ).

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