Question

if tan A =7/13 then sin A =_____?​

Answer 1

(sinx+cosx)2+(sinx−cosx)2

=sin2x+cos2x+2sinxcosx+sin2x+cos2x−2sinxcosx

(sinx+cosx)2+(713)2

=2(sin2x+cos2x)

(sinx+cosx)2+49169

=2(1)

(sinx+cosx)2=2−49169

(sinx+cosx)2=289169