Question

3 + 2ctg^2 x * sin^2x, если cos x= - 0,2

Answer 1

$3+2 ctg^{2} x * sin^{2} x = 3+2frac{cos^{2} x}{sin^{2} x} * sin^{2} x =3+2cos^{2} x=3+ 2(-0,2)^{2} =$$3+2*0,04=3,08$