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Aleksandr [31]
3 years ago
7

How many elements are in the set​ {x | x is an even prime​ number, xless than100​}?

Mathematics
1 answer:
maxonik [38]3 years ago
8 0
The answer is obviously {2}since there are NO EVEN PRIME NUMBERS, except for 2. So,there is only 1 element.
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(Photo attached) Trig question. Thanks in advance! :)
kolbaska11 [484]

Answer:

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Step-by-step explanation:

There are a couple of ways to go at these. One is to use the sum and difference formulas for the cosine and sine functions. To do that, you need to find the sine for the angle whose cosine is given, and vice versa.

Another approach is to use the inverse trig functions to find the angles α and β, then combine those angles and find find the desired function of the combination.

For the first problem, we'll do it the first way:

  sin(α) = √(1 -cos²(α)) = √(1 -.926²) = √0.142524 ≈ 0.377524

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a) cos(α+β) = cos(α)cos(β) -sin(α)sin(β)

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  cos(α+β) ≈ 0.8784

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b) sin(β -α) = sin(arcsin(0.111) -arccos(0.926)) ≈ sin(6.3730° -22.1804°)

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Answer:

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