Cos pi/4 - Find Value of Cos pi/4

Cos pi/4 degrees is the value of cosine trigonometric function for an angle equal to pi/4. Understand methods to find the value of cos pi/4 with examples and FAQs.

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Prove that: `cos(pi/4-x)cos(pi/4-y)-sin(pi/4-x)sin(pi/4-y)=sin(x+y)`

Exact value of cosine of minus PI/4 –

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cos^4 pi/8 + cos^4 3pi/8 + cos^4 5pi/8 + COS^4 7pi/8 = (A) 1/2 (B) 1/4 (C)3/2 (D) 3/4

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