Simplifying sqrt((t cos t)² + (t sin t)²)

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jimbo71
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Homework Statement


sqrt((tcost)^2+(-tsint)^2


Homework Equations





The Attempt at a Solution


pulled out the sin^2t+cos^2t
added the two t^2
took the sqrt of
t*sqrt(2)
 

Discussion

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No, it's not correct. Factor the inside of the sqrt before you start 'pulling things out'.
 
so is the answer simply t
 
jimbo71 said:
so is the answer simply t

Almost right. |t| actually.