11. Evaluate :
cos 3A -
(ii)
3 sin 3 B + 2 cos (2 B + 5°)
-------------------------------------
2 cos 3 B – sin (2 B - 100)
when B = 20°
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(2 B + 5°)
-------------------------------------
2 cos 3 B – sin (2 B - 100)
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