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Delvig [45]
3 years ago
5

Is dividing by 1/2 the same thing as multiplying by 2??

Mathematics
2 answers:
Delicious77 [7]3 years ago
7 0
Hmmmm let's see hmmm let's try with any number.. say  25

\bf 25\cdot 2\implies \boxed{50}\impliedby \times 2
\\\\\\
25\div \cfrac{1}{2}\implies \cfrac{25}{\frac{1}{2}}\implies \cfrac{\quad \frac{25}{1}\quad }{\frac{1}{2}}\implies \cfrac{25}{1}\cdot \cfrac{2}{1}\implies \boxed{50}\impliedby \div \frac{1}{2}
GuDViN [60]3 years ago
4 0
Yes it is actually test it out in a claculator for proof
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<h3>20.</h3>

You have memorized that cos(x) = (√3)/2 is true for x = 30°. That is the reference angle for the 2nd-quadrant angle 180° -30° = 150°, and for the 3rd-quadrant angle 180° +30° = 210°.

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<h3>Bonus</h3>

  You have memorized that sin(π/4) = √2/2, and that cos(3π/4) = -√2/2. The sum of these values is ...

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<em>Additional comments</em>

Your calculator can help you with both of these problems.

The coordinates given on the attached unit circle chart are (cos(θ), sin(θ)).

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