Evaluate without using a calculator sin(90-x)cos(180-x)+tanx.cos(-x)sin(180+x)
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We see here in the diagram that the base is a. We know this because the height is perpendicular to it. We also know the height is bsin(C) which, when replace h for bsin(C) and a for the base, we get A=absin(C), which is the second option.
