21.pdf - R \u03c0\/2 0 3 cos2 \u03b8 d\u03b8 =3 R \u03c0\/2 3 2 \u0002 \u03b8 = 0 1(1 cos 2\u03b8 d\u03b8[half-angle identity 2 \u0002 \u0003\u03c0\/2 \u0001 \u0003 1 sin 2\u03b8 0 = 32 \u03c02 0 \u2212(0 0 = 3\u03c0 2 4

21.pdf - R u03c0/2 0 3 cos2 u03b8 du03b8 =3 R u03c0/2...

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Unformatted text preview: R π/2 0 3 cos2 θ dθ =3 R π/2 3 2  θ+ = 0 1 (1 + cos 2θ) dθ [half-angle identity] 2  π/2   1 sin 2θ 0 = 32 π2 + 0 − (0 + 0) = 3π 2 4 ...
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