Welcome to your Trigonometry

2.
sin(α + β) + sin(α – β)/cos(α + β) + cos(α – β) =

3.
In 30 minutes, the minutes hand of a clock turns through

5.
Given a right triangle ABC. Angle C is the right triangle. BC=4 and the altitude to the hypotenuse is 1 unit. Find the area of the triangle.

6.
One second is denoted by

7.
If α, β, γ are the angles of a triangle ABC, then sin(α + β) =

8.
A ladder 5 meter long leans on a wall and makes an angle of 30˚ with the horizontal. Find the vertical height from the top to the ground.

9.
If cosθ = 1/√2, then θ is equal to

11.
The area of a sector of a circular region of radius r and the central angle of the sector θ radians is

12.
The central angle of an arc of a circle whose length is equal to the radius of the circle is called the

13.
In an oblique triangle, a=25, b=16, angle C=94˚06’. Find the measure of angle A.

14.
sin3θ/sinθ -cos3θ/cosθ =

15.
If α,β,γ are the angles of a triangle ABC, then cos(α + β) =

16.
The 60th part of one degree is called one

17.
An arc AB of length of 5 cm is marked on a circle is marked on a circle of radius 3cm. The area of sector bounded by this arc and radii from A and B is

18.
sinAcosB + sinBcosA= ?

19.
Two cities whose longitudes are 20°E and 40°W on the equator are apart

20.
The system of measurement in which the angle is measured in radians called the

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