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Using a “cardboard paper” used as an improvise for graph paper, draw the graph of

y = 1 – 2 cos ϑ, for values of ϑ from O0

to 240. On the same axis, draw the graph of y =

ϑ

/80 and hence , solve the equation.

a. 160cos ϑ = 80 – ϑ

b. Find the value of y when ϑ = 1350

c. Find the value of ϑ when y = - 0.5 on the graph of y = 1 – 2cos ϑ​