Question

cos((−11π)/3)

Answer 1

welcome to OS :)

Answer 2

\[\frac{ 11 \pi }{ 3}=3 \pi +\frac{ 2 \pi }{ 3 }\]

Answer 3

\[3\pi =2\pi+\pi\]

Answer 4

\[=2\pi+\pi+\frac{ 2\pi }{ 3 }\]

Answer 5

2 pi we can remove it ....

Answer 6

\[\cos (-2\pi-\theta)=\cos (-\theta)\]

Answer 7

\[\cos (-(2\pi+(\pi+\frac{ 2\pi }{ 3 }))=\cos (-(\pi+\frac{ 2\pi }{ 3 })\]

Answer 8

\[\pi+2\pi/3=180+120=300 degree\]

Answer 9

- 300 degree

Answer 10

so -300 will be in first quaderent so cos will give positive value here ...as trigonometric functio give positive value nin first quad

Answer 11

\[-300=-360+60\]

Answer 12

BUT 360= 2pi we can remove it
so we left with 60 only that is pi/3

Answer 13

\[\cos (\frac{ \pi }{ 3 })=???\]