Question

show the steps on how to do this problem

Answer 1

$(i) \: cos \: 21 = \frac{3}{x} \\ \\ 0.93358 = \frac{3}{ x} \\ \\ x = \frac{3}{0.93358} \\ \\ x = 3.21$

$(ii) \: cos \: 21 = \frac{x}{3} \\ \\ 0.93358 = \frac{x}{3} \\ \\ 0.93358 \times3 = x \\ \\ 2.80= x$

$(iii) \: cos \: (x) = \frac{4}{7} \\ \\ cos(x) = 0.57 \\ \\ cos \: 55 = 0.57$