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Ilia_Sergeevich [38]
3 years ago
7

Explain how the sum and difference formula cos(A+/- B) = cosA cosB -/+ sinA sinB could be useful?

Mathematics
2 answers:
Nadya [2.5K]3 years ago
7 0
You could find the exact value of cos of 15 degrees   by  using cos(45 - 30):-

cos(45 - 30) = cos 45cos30 + sin45 sin30  = 1 /sqrt2 * sqrt3/2 +  1/sqrt2* 1/2 
serg [7]3 years ago
6 0
One way it's useful is in the application of phasors in physics. Phasors require you to add up vectors of two different angles, so the cosine angle addition formula can be used if you already know the cosine and sine of the original vector angles.
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Answer:

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9514 1404 393

Answer:

  ∠Q = 89°

  ∠R = 123°

  ∠S = 91°

Step-by-step explanation:

It seems easiest to start by finding the measures of each of the arcs. The measure of an arc is double the measure of the inscribed angle it subtends.

  arc QRS = 2·∠P = 114°

So, ...

  arc QR = arc QRS - arc RS = 114° -41° = 73°

The total of the arcs around the circle is 360°, so ...

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  ∠Q = (1/2)(arc RS + arc PS) = (1/2)(41° +137°)

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  ∠R = (1/2)(arc PS +arc PQ) = (1/2)(137° +109°)

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  ∠S = (1/2)(arc PQ +arc QR) = (1/2)(109° +73°)

  ∠S = 91°

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