Question

найдите значения выражения 6cos207/cos27

Answer 1

6cos207°/cos27° = 6cos(180° + 27°)/cos27° = -6cos27°/cos27° = -6.

Answer 2

6сos(207)/cos(27)=6cos(180+27)/cos(27)=-6cos(27)/cos(27)=-6
cos(180+x)=-cosx