sin A = 1/2√2 = sin 45 | cos A = 1/2√2
sin B = 3/5, 3 (sisi depan), 5 (sisi miring), 4 (sisi samping) | cos B = 4/5
sin (A+B) = sinAcosB + cosAsinB
= 1/2√2 • 4/5 + 1/2√2 • 3/5
= 2/5√2 + 3/10√2
= 7/10√2 (B)
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sin A = 1/2√2 = sin 45 | cos A = 1/2√2
sin B = 3/5, 3 (sisi depan), 5 (sisi miring), 4 (sisi samping) | cos B = 4/5
sin (A+B) = sinAcosB + cosAsinB
= 1/2√2 • 4/5 + 1/2√2 • 3/5
= 2/5√2 + 3/10√2
= 7/10√2 (B)