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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
Sagot :
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