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70\times \frac{1}{2}\sin(30)
Multiply 7 and 10 to get 70.
35\sin(30)
Multiply 70 and \frac{1}{2} to get 35.
35\times \frac{1}{2}
Get the value of \sin(30) from trigonometric values table.
\frac{35}{2}
Multiply 35 and \frac{1}{2} to get \frac{35}{2}.