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[" 17."tan20^(@)+2tan50^(@)-tan70^(@)=.....

[" 17."tan20^(@)+2tan50^(@)-tan70^(@)=...],[" 18."" सu "64 pi" sel "3,cos2x cos(x)/(2)-cos3x cos(9x)/(2)=sin5x sin(5 pi)/(2)],[" Below question is for "3" marks "]

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