26. Evaluate dxdydz a. 1/3 b. 1/4 c. 1/2 d. 1/6 27. The factor 8 = π/2 is multiplied in the evaluation of Wallis formula, where m and n are powers of sin and cosine respectively and are integers greater than or equal to zero, if a. m and n are both odd c. m and n are both even d. n is odd b. m is odd (x² + y²) dxdy c. 17/2 d. 37/2 28. Evaluate a. 35/2 b. 19/2

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