Sin(a+b) =sinacosb+cosasinb
A=30'
B=60
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Sin (30+60) = sin30×cos60 + cos30×sin60
sin90 = (1/2 × 1/2) + root 3/2 × root 3/2
1 = 1/4 + 3/4
1 = 1
sin90 = (1/2 × 1/2) + root 3/2 × root 3/2
1 = 1/4 + 3/4
1 = 1
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