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4 years ago

Find the explicit formula for -3,-33,-63,-93

Mathematics

1 answer:

bagirrra123 [75]4 years ago

5 0

Answer:

a n = -3+(n-1)-30

Step-by-step explanation:

-3 - 30 = -33

-33 - 30 = -63

-63 - 30 = -93

The common difference here is -30. d = -30

The explicit formula is a n = a1 + (n-1)d

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Answers:

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=====================================================

The given info is:

sin(theta) = 12/13
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From that, we can use the pythagorean trig identity to find that cos(theta) = -5/13. Keep in mind that cosine is negative in quadrant II.

Now use the trig identity below to compute cos(2theta)

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Other options you could use are these identities

$\cos(2\theta) = 2\cos^2(\theta)-1\\\\$

$\cos(2\theta) = 1-2\sin^2(\theta)\\\\$

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