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noname [10]
3 years ago
6

Please help evaluate this and turn into a fraction

Mathematics
1 answer:
madam [21]3 years ago
6 0

Answer:

  The correct answer is marked.

Step-by-step explanation:

You are given the cosine of an angle, and asked to find the corresponding sine. The relation is ...

  sin(x)² = 1 - cos(x)²

  sin(x)² = 1 - (-4/√305)² = 1 - 16/305 = 289/305

  sin(x) = √(289/305) = 17/√305

__

The arccos function will return an angle in the first or second quadrant. This negative cosine corresponds to a 2nd-quadrant angle. The sine is positive in the second quadrant.

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Answer:

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Step-by-step explanation:

\frac{2}{3}  \times  \frac{3}{4}  +  \frac{3}{7}  \times  \frac{3}{4}

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