Li-Fan Chen => YSITD: sin^2+cos^2=1 sin*tan=c sin(x)=cos(90-x) sin*csc=1 #58fed8ef3c2bc8baefaa965e

Li-Fan Chen says to YSITD

sin^2+cos^2=1 sin*tan=c sin(x)=cos(90-x) sin*csc=1

at Tue, Apr 25, 2017 7:12 AM