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Tasya [4]
3 years ago
13

A clothing store is having a sale on T-shirts. The first T-shirt you buy costs

Mathematics
1 answer:
satela [25.4K]3 years ago
5 0

Answer: Arithmetic Sequence

Step-by-step explanation: An Explicit Formula for the sequence is f(n)= 7+5(n-1)

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Which sum or difference identity could be used to prove that sin(π + q) = -sin q
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Answer:

we should know that :

sin ( a + b ) = sin a * cos b + sin b cos a

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sin (π + q) = sin π * cos q + sin q * cos π

sin π = zero and cos π = -1

∴ sin (π + q) = 0 * cos q + sin q * (-1) = - sin q

<u>Another solution:</u>

The angle (π + q) lies in the third quarter ⇒ (1)

(π + q) and (-q) are supplementary angles ⇒ (2)

From (1) and (2)

sin(π + q) = -sin q

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