Question

1+cos 2x
per cos x

lim
x= 0,5 ki

Answer 1

Dik : x = 0,5
= 1 +  cos 2× / cos x
= 1 + cos 2.0,5 / cos 0,5
= 1 + cos 1 / cos 0,5
= 1 + 0,9998 / 0,9999
= 1,9998

Answer 2

Ubah 1+cos2x = 1+(1-2sin^2(x)) = 2-2sin^2(x) = 2(1-sin^2(x)) = 2cos^2(x) shg limitnyq jdi 2cos^2(x)/cos(x) = 2cos(x) = 2cos(90) =2.. jdikan yg trbaik y :)