Question

Sin^4 +cos^4 =1+4k sin^2cos^2 then k equal to

Answer 1

(sin^2+cos^2)^2-2sin^2cos^2=1+4ksin^2cos^2
1-2sin^2cos^2=1+4ksin^2cos^2
then k=-1/2 is ur answer if ur is then me brainiest