WAEC - Further Mathematics (2019 - No. 7)

Given that g ; x \(\to\) 3x and f ; x \(\to\) cos x. Find the value of g\(^o\) f(20\(^o\)) 
0.50
0.94
2.60
2.82

Explanation

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

g(0.9397) = 3(0.9397)

= 2.82

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