Question #4f2b1
2 Answers
Jul 19, 2017
Explanation:
Use the identity:
Use the identity:
Jul 19, 2017
Explanation:
#"expand " (sinx+cosx)^2#
#rArr(sin^2x+2sinxcosx+cos^2x-1)/cos^2x#
#•color(white)(x)sin^2x+cos^2x=1#
#rArr(2sinxcosx+1-1)/cos^2x#
#=(2sinxcancel(cosx))/(cancel(cosx)cosx)=2sinx/cosx=2tanx#