Question 429591
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Hi
5=3+7cos((3.14/4)(x-3))   Note cos((3.14/4) = {{{sqrt(2)/2}}}
{{{((2/7)/(sqrt(2)/2)) = (x-3)}}}
{{{(2sqrt(2)/7) = (x-3)}}}
{{{(2sqrt(2)/7) + 3 = x}}}
thought this (cosx,sinx) Summary may be useful to You in Your work
<img src="http://www.math.ucsd.edu/~jarmel/math4c/Unit_Circle_Angles.png">