Question

kak tolongin nomor 5 yang point D ​

Answer 1

[tex].[/tex]

a. tan 150°

= tan 150°

= tan (180° - 30°)

= - tan 30°

[tex] = - \frac{ 1}{3} \sqrt{3} [/tex]

---------

b. sin 210°

= sin 210°

= sin (180° + 30°)

= - sin 30°

[tex] = - \frac{1}{2} [/tex]

---------

c. cos (-120°)

= cos (-120°)

= cos (120°)

= cos (180° - 60°)

= - cos 60°

[tex] = - \frac{1}{2} [/tex]

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d. sec 660°

= sec 660°

= sec 300°

= 1/cos (300°)

= 1/cos (360° - 60°)

= 1/cos 60°

[tex] = \frac{1}{ \frac{1}{2} } [/tex]

[tex] = 2[/tex]