Photos 2SIN Π X

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2sin π x. Sin2 𝑥 4 − cos2 𝑥 4 = sin ( 𝜋 2 + 𝑥). Cos(2π-x)-sin(3π/2+x)=1. Cos(2π-x) +sin(π/2+x) =√2. 2cos 4 2 π cos sin3 sin 3 4 x x x x          .
Sin2 𝑥 4 − cos2 𝑥 4 = sin ( 𝜋 2 + 𝑥). Cos(2π-x)-sin(3π/2+x)=1. Cos(2π-x) +sin(π/2+x) =√2. 2cos 4 2 π cos sin3 sin 3 4 x x x x          .

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