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sin A = 12/13
cos A = √1 - (12/13)² = √1 - 144/169 = √(169-144)/169 = √25/169 = 5/13
cos B = 3/5
Maka:
sin 2A + cos B = 2 sin A cos A + cos B
= 2 x 12/13 x 5/13 + 3/5
= 120/169 + 3/5