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WAEC Further Mathematics 2020 Paper

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Question : 3

Total: 39

If cos x = -0.7133, find the values of x between 0

^o

^o

44.5 $^o$ , 224.5 $^o$
123.5 $^o$ , 190.5 $^o$
135.5 $^o$ , 213.5 $^o$
135.5 $^o$ , 224.5 $^o$

Solution:

cos x = -0.7133

x = cos $^{-1}$ (0.7133)

= 44.496 $^o$

x = 180 - 44.495 $^o$

x = 135.5 $^o$

and x = 180 $^o$ + 44.495 $^o$

= 224.5 $^o$

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