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kolbaska11 [484]
2 years ago
15

The 25th term of a sequence is 121. The 80th term is 506. What is the first term

Mathematics
1 answer:
shtirl [24]2 years ago
6 0

Answer:

-47

Step-by-step explanation:

that's the correct answer

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Answer:

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Step-by-step explanation:

By using the cos square identity in trigonometry i.e., cos2ϴ = 1 – sin2 ϴ, we can evaluate the exact value of cos(33 ). For calculating the exact value of cos(∏/6), we have to substitute the value of sin(30°) in the same formula.

cos(30°) = √1 – sin230°

The value of sin30° is 1/2 (Trigonometric Ratios)

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cos(30°) = √3/4

Therefore, cos(30°) = √3/2

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Step-by-step explanation:

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