If5sinx+12cosx=13 then tanx=?
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5/13sinx+12/13cosx=1
cosa.sinx+sina.cosx=1 or
sina.sinx+cosa.cosx=1
sin(a+x)=pie/2 or cos(a-x)=0
a+x=pie/2 or a-x=0
a=x=pie/4
tanx=1
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