Question

помогите с 3 и 5 заданием пожалуйста

Answer 1

3)  ctg(-t)*sint + cos(π + t) = -[(cost)(sint)]/sint - cost =  - cost - cost = - 2cost
5)  4sin(4π + π/6) - 8*[cos^2(π + π/6)] +(√27)*ctg(4π - π/3) = 4*sin(π/6) - 8*cos^(π/6) - (√27)* ctg(π/3) = 4*(1/2) - 8*[(√3/2)^2] - (√27)*(1/√3) = 2 - 6 - 3 = -7