Quinn M.

asked • 11/07/22

Let sint=a​, cost=b​, and tant=c. Write the expression in terms of​ a, b, and c.

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Tom B. answered • 11/07/22

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Quinn M.

oh gosh I forgot to add the equation sin(t+4π)−cos(t+8π)+tan(t+3π)
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11/07/22

Tom B.

Thanks for sending this. The concept here is that trig functions repeat every 2pi so sin t = sin (t+2pi) = sin (t+4pi) = etc. So sin (t+4pi) = sin t = a, and cos (t+8pi) = cos t = b. But what is tan (t+3pi), which is equal to tan (t+pi)? It is helpful to think of tan = sin / cos. Also, sin(t+pi)=-sin(t) and cos(t+pi)=-cos(t) So, tan(t+pi) = sin(t+pi)/cos(t+pi) = -sin(t)/-cos(t) = tan t . So tan(t+3pi) = tan t = c. So the answer to question would simply be: a - b + c
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11/07/22

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