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Makovka662 [10]
3 years ago
5

Given that cos (x) = k what does cos (2x) = ? Thanks in advance :)

Mathematics
2 answers:
Olin [163]3 years ago
5 0

Answer:

(2x) = 2k

Step-by-step explanation:

If x = k, then 1x=1k, then 2x=2k

g100num [7]3 years ago
3 0

Answer:

2k² - 1

Step-by-step explanation:

cos x =k

cos 2x = 2 cos ² x - 1

           = 2k² - 1

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