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Rzqust [24]
3 years ago
13

What is the probability that a student chooses drama as an elective

Mathematics
1 answer:
Ad libitum [116K]3 years ago
7 0

Answer:

The probability that a student chooses drama as an elective is 0.07 or 7%

Step-by-step explanation:

brainliess plsss!

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Prove that sinA-sin3A+sin5A-sin7A/cosA-cos3A-cos5A+cos7A= cot2A
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Write the left side of the given expression as N/D, where
N = sinA - sin3A + sin5A - sin7A
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We shall use these identities:
sin x - sin y = 2cos((x+y)/2)*sin((x-y)/2)
cos x - cos y = -2sin((x+y)/2)*sin((x-y)2)

N = -(sin7A - sinA) + sin5A - sin3A
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D = cos7A + cosA - (cos5A + cos3A)
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Therefore
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      = cot2A

This verifies the identity.
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3 years ago
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