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Given that g ; x \(\to\) 3x and f ; x \(\to\) cos x. Find...

Further Mathematics
WAEC 2019

Given that g ; x \(\to\) 3x and f ; x \(\to\) cos x. Find the value of g\(^o\) f(20\(^o\)) 

  • A. 0.50
  • B. 0.94
  • C. 2.60
  • D. 2.82
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Correct Answer: Option D
Explanation

f(20\(^o\)) = cos 20\(^o\) = 0.9397

g(0.9397) = 3(0.9397)

= 2.82


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