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निम्नलिखित के मान ज्ञात करे sin^(2) (...

निम्नलिखित के मान ज्ञात करे `sin^(2) (pi)/(8)+sin^(2) (3pi)/(8)+sin^(2)(5pi)/(8)+sin^(2)(7pi)/(8)`

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(cos^(2)pi)/(8)+(sin^(2)(3 pi))/(8)+(sin^(2)(5 pi))/(8_(sin)^(2))(7 pi)/(8)=2

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Show that: sin^2 pi/8 + sin^2 (3pi)/8+sin^2 (5pi)/8+sin^2 (7pi)/8=2