find value of sin2 11.25 + sin2 33.75 + sin2 56.25 + sin2 78.75 Share with your friends Share 0 Rishabh Mittal answered this sin211.25+sin233.75+sin256.25+sin278.75=sin211.25+sin233.75+sin290-33.75+sin290-11.25=sin211.25+sin233.75+cos233.75+cos211.25 Since sin90-x=cos x=sin211.25+cos211.25+sin233.75+cos233.75=1+1 Since sin2x+cos2x=1=2 ANS... 1 View Full Answer
