Trigonometric Ratios of Half Angles
Trending Questions
Q.
In triangle ABC, a =2, b =3 and sin A=23, then B is equal to
30°
60°
90°
120°
Q.
What is the value of ?
Q.
The value of is
Q. Let in a right angled triangle, the smallest angle be θ. If a triangle formed by taking the reciprocal of its sides is also a right angled triangle, then sin θ is equal to :
- √5+14
- √2−12
- √5−12
- √5−14
Q.
If in a , , then
Q. In triangle ABC, let a, b, c be the lengths of the sides opposite to the angles A, B, C respectively. Let the value of a3cos3B+3a2bcos(A−2B)+3ab2cos(2A−B)+b3cos3A be l. Then the value of lc3 is equal to
Q. If ΔABC is right angled at A, then the value of r2+r3 is:
- r1−r
- r1+r
- s−r
- a
Q. If A, B and C are the interior angles of triangle ABC, then sec(B+C-A)divided by 2=
Q. If cotangents of half the angles of a triangle are in A.P., then the sides of the triangle are in .
- A.P.
- G.P.
- H.P.
- A.G.P.