Question

If α and B are the measures of two first quadrants angles and sinα=4/5 and sin B= 5/13 find sin (α+B)

Answer 1

Find sinα=4/5 and sin B= 5/13

Answer 2

sinα=4/5
α=53.13, 126.87
----------------------
sin B= 5/13
B=22.62, 157.38
then
sin (α+B)

sin (53.13+22.62)................(1)
sin(126.87+157.38)..............(2)

Answer 3

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