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OpenStudy (anonymous):
y(θ) = 13 + 8cos(7θ) What is the largest value of the function?
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jimthompson5910 (jim_thompson5910):
Hint: cosine has the smallest value of -1 and the largest value of 1 ie, if y = cos(x), then -1 <= y <= 1
OpenStudy (anonymous):
see -1<=cos x <=1 hence -1<=cos(7θ)<=1
OpenStudy (anonymous):
-1*8<=8*cos(7θ)<=1*8 -8<=8cos(7θ)<=8 or 13-8<=8*cos(7θ)<=13+8 thus largest value is 21
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