Question

упростите выражение:
а) cos(t-x)-sintsinx
б)1/2cost-sin(pi/6+t)

Answer 1

cos(t-x)-sintsinx=costcosx+sintsinx-sintsinx=costcosx

1/2cost-sin(π/6+t)=1/2cost-1/2cost-√3/2sint=-√3/2sint