Найдите значения выражения 3cos (P-B)+sin (P/2+B)/cos(B+3P)=
(3cos(π -β)+sin(π/2 +β))/cos(3π+β) =( -3cosβ +cosβ)/(-cosβ) = (-2cosβ)/(-cosβ) =2. ******************************************************* 3cos(π -β)+sin(π/2 +β)/cos(3π+β) = -3cosβ +cosβ)/(-cosβ) = - 3cosβ -1 .