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How do I solve these problems without using a calculator?

How do I solve these problems without using a calculator?-example-1
User Jonplaca
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1 Answer

5 votes

N 1

Remember that


\begin{gathered} \cos (60^o)=(1)/(2) \\ \sin (60^o)=\frac{\sqrt[]{3}}{2} \end{gathered}

therefore

the angle theta is equal to

180-60=120 degrees

the angle lies in the second quadrant

the answer part 1 is 120 degrees or 2pi/3

N 2

Remember that


\sin (60^o)=\frac{\sqrt[]{3}}{2}

and the value of the tangent is positive

that means

the angle theta lies on the I quadrant

the angle theta is equal to 60 degrees or pi/3

N 3

i will assume that u/d is undefined

so

Remember that

the value of the sine is equal to 1 when the angle is 90 degrees (I quadrant) for the given interval [0,360]

therefore

the angle theta is 90 degrees or pi/2

User Brendan Berg
by
7.9k points

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