Q2 of 46 Page 284

Choose the right option and justify your choice -

C)


A. cos 60°


B. sin 60°


C. tan 60°


D. sin 30°

We know that,

tan 30° = 1/√3


So, using this value of tangent, we can write



⇒


⇒


⇒


⇒


⇒


And we know, tan 60° = √3


But, cos 60° = 1/2


sin 60° = √3/2


& sin 30° = 1/2


Thus, option (C) is correct.

More from this chapter

All 46 →
2

Choose the right option and justify your choice -

A)


A. sin 60°


B. cos 60°


C. tan 30°


D. sin 30°

 2

Choose the right option and justify your choice -

B)


A. tan 90°


B. 1


C. sin 45°


D. 0

 3

Evaluate sin 60° cos 30° + sin 30°cos 60°. What is the value of sin(60° + 30°). What can you conclude?

 4

Is it right to say cos(60° + 30°) = cos 60° cos 30° - sin 60° sin 30°.