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Intensive Precalculus Video Lecture 5.1

 
 
MujumdarJyoti的头像
Intensive Precalculus Video Lecture 5.1
MujumdarJyoti - 2020年06月6日 Saturday 09:43
 

In video lecture 5.1 for the intensive precalculus course, at 12:10, we got that sin^2 (Θ)=1/5. Then, Mr. Reynoso said that sin (Θ)=±1/5. Shouldn't sin (theta) equal ±1/√5 because you have to take the square root of 1/5?

 
ProfessorAreteem的头像
Re: Intensive Precalculus Video Lecture 5.1
ProfessorAreteem - 2020年06月8日 Monday 20:02
 

Thanks for pointing this out. You are correct, it should be $\pm \dfrac{1}{\sqrt{5}}$, and not $\pm\dfrac{1}{5}$.

 
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