s i n 2 x + c o s 2 x = 1 {\displaystyle sin^{2}x+cos^{2}x=1} 1 + c o t 2 x = c s c 2 x {\displaystyle 1+cot^{2}x=csc^{2}x} 1 + t a n 2 x = s e c 2 x {\displaystyle 1+tan^{2}x=sec^{2}x}
t a n x = ( s i n x ) / ( c o s x ) {\displaystyle tanx=(sinx)/(cosx)}
