Prove sin 2 - - 8-sin 23 - - 8-sin 25 - - 8-sin 27 - - 8-2

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Derivative of Some Standard Functions

Prove sin 2 π...

Question

Prove sin2 π/8 + sin2 3π/8 + sin2 5π/8 + sin2 7π/8 = 2

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Solution

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{sin}^{2} \frac{π}{8} + {sin}^{2} \frac{3 π}{8} + {sin}^{2} \frac{5 π}{8} + s i n^{2} \frac{7 π}{8} = 2

{sin}^{2} \frac{π}{8} + {sin}^{2} \frac{3 π}{8} + {sin}^{2} \frac{5 π}{8} + {sin}^{2} \frac{7 π}{8}

{sin}^{2} \frac{π}{8} + {sin}^{2} \frac{3 π}{8} + {sin}^{2} \frac{5 π}{8} + {sin}^{2} \frac{7 π}{8} = m

m

Prove that:

$s i n^{2} \frac{π}{8} + s i n^{2} \frac{3 π}{8} + s i n^{2} \frac{5 π}{8} + s i n^{2} \frac{7 π}{8} = 2$

s i n^{2} (\frac{π}{4}) + s i n^{2} (\frac{3 π}{4}) + s i n^{2} (\frac{5 π}{4}) + s i n^{2} (\frac{7 π}{4})

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