Verified Answer :

meerkat18

we use the trigonometric identities in this problem.

=(sin(t)cos(4π)+sin(4π)cos(t))−(cos(t)cos(8π)−sin(t)sin(8π)) +tan(t)+tan(5π)/1−tan(t)tan(5π)
=sin(t)+0−cos(t)+0+ tan(t)1−0=sin(t)−cos(t)+tan(t)
=a−b+c

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