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photoshop1234 [79]
3 years ago
6

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q?

Mathematics
1 answer:
lutik1710 [3]3 years ago
8 0
<h3>Answer: Choice C</h3>

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

In this case, we'd have a = 180 and b = q, so,

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

cos(180 - q) = cos(180)cos(q) + sin(180)sin(q)

cos(180 - q) = -1*cos(q) + 0*sin(q)

cos(180 - q) = -cos(q) + 0

cos(180 - q) = -cos(q)

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