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80+7\sin(\frac{1080}{12})
Multiply 180 and 6 to get 1080.
80+7\sin(90)
Divide 1080 by 12 to get 90.
80+7\times 1
Get the value of \sin(90) from trigonometric values table.
80+7
Multiply 7 and 1 to get 7.
87
Add 80 and 7 to get 87.