Posted by lindsay on Wednesday, May 2, 2012 at 4:35pm.
recalling that sin pi/4 = cos pi/4 = 1/√2
and
sin(a+b) = sina*cosb + cosa*sinb,
a.
x = 5pi/4 or 7pi/4
b.
x/3+5 = pi/6 or 5pi/6
x = 13pi/2-15
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