trig
posted by SONU .
Find the smallest positive value of x(in degree) for which tan(x+100°)=tan(x+50°)*tanx*tan(x50°)

trig 
MathMate
Try an approximate graphical solution and refine solution by iterations.
Here's a graphical solution (x is in radians)
http://imageshack.us/photo/myimages/853/1313249887.png/
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