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Answer:
REF.Image
Area of parallelogram
= base × height
=27×12cm
= 324cm2
Area = b×h
324=36×h
36/324=h h= 9 cm
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so that sin2x = 2 sin x cos x.
And this is how our first double-angle formula, so called because we are doubling the angle (as in 2A).
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