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High school compulsory 4 math problems are very simple and online.
1.tan a, tan b is the equation 2x? Two Real Roots of +3x-7=0

∴tan a+ tan b=-3/2

tan a tan b=-7/2

tan(a+b)=(tan a+tan b)/( 1-tan a tan b)=- 1/3

2 . tan2a = tan(a+b+a-b)= tan(a+b)+tan(a-b)/ 1-tan(a+b)tan(a-b)=-4/7

tan2b = tan(a+b-(a-b))= tan(a+b)-tan(a-b)/ 1+tan(a+b)tan(a-b)=- 1/8