Trigonometric Ratios of Compound Angles
Trending Questions
Q. In Δ ABC, if cot A + cot B + cot C = √3, then ABC is an
- Right angled triangle
- Eequilateral triangle
- Isosceles
- None
Q.
If α, β γ, ϵ(0, π2), then sin(α+β+γ)sin α+sin β+sin γ is
< 1
None of these
> 1
= 1
Q. If sin α=1√5 and sin β=35, then β−α lies in the interval
Q. √3 cosec 20∘−sec 20∘=
Q. sin2α+cos2(α+β)+2sinα.sinβcos(α+β)=
Q. cos21∘+cos22∘+cos23∘+....+cos290∘=
- 0
- 1
- 45
Q. If xcos θ=ycos(θ−2π3)=zcos(θ+2π3), then x + y + z=
- None of these
- 1
- 0
- -1
Q. If tan θ=sin α−cos αsin α+cos α then sin α+cos α and sin α−cos α
and must be equal to
and must be equal to
Q. (1+cosπ8)(1+cos3π8)(1+cos5π8)(1+cos7π8)=
Q. If A + B = 225∘, then cotA1+cotA.cotB1+cotB=
- 0