Question

Answer for 2 question

Answer 1

Answer

1.40577687044

c)(√15+√3)/4

Explanation

cos66°+sin84°

=cos(90-24)+sin(90-6)

=sin24+cos6

=2sin12cos12+cos6

=2sin12[1-sin^2(6)]+cos6

=4sin6cos6[1-sin^2(6)]+cos6

=4sin6cos6-4sin^3(6)cos6+cos6

=4(0.10453)(0.9945)-4(.10453)^3(.9945)+.9945

=0.41582034-.00454346956+0.9945

=0.41127687044+0.9945

=1.40577687044