## How do you find the exact value of a half angle?

Using Half-Angle Formulas to Find Exact Values

- sin2θ=1−cos(2θ)2sin2(α2)=1−(cos2⋅α2)2=1−cosα2sin(α2)=±√1−cosα2.
- cos2θ=1+cos(2θ)2cos2(α2)=1+cos(2⋅α2)2=1+cosα2cos(π2)=±√1+cosα2.
- tan2θ=1−cos(2θ)1+cos(2θ)tan2(α2)=1−cos(2⋅α2)1+cos(2⋅α2)tan(α2)=±√1−cosα1+cosα

**What is the half angle formula for cosine?**

We obtain half-angle formulas from double angle formulas. Both sin (2A) and cos (2A) are derived from the double angle formula for the cosine: cos (2A) = cos2(A) − sin2(A) = cos2(A) − (1 − cos2A) = 2cos2(A) − 1.

**What are the six trigonometric functions for?**

Trigonometry, the branch of mathematics concerned with specific functions of angles and their application to calculations. There are six functions of an angle commonly used in trigonometry. Their names and abbreviations are sine (sin), cosine (cos), tangent (tan), cotangent (cot), secant (sec), and cosecant (csc).

### How do you calculate the missing side of a triangle?

Answer. Finding the missing side of a right triangle is a pretty simple matter if two sides are known. One of the more famous mathematical formulas is a2 +b2 = c2, which is known as the Pythagorean Theorem. The theorem states that the hypotenuse of a right triangle can be easily calculated from the lengths of the sides.

**What is sin 2 theta?**

Sin 2 theta is the sine of the angle which is double the value of theta. A formula to calculate sin 2 theta is: Sin 2 theta = 2 x (sin theta) x (cos theta)

**How do you find the dimensions of a right triangle?**

To determine if the triangle is a right triangle, we use the Pythagorean theorem to test or see if the data agrees. We do as follows: c² = a² + b². 10² = (5√3)² + 5². 100 = 75 + 25. 100 = 100. Therefore, the triangle with the given measurements is a right triangle.

#### How do you find the right triangle?

A Right Triangle is identified by one of it’s angles. If one angle in the triangle is a Right Angle (90 degrees) then the triangle is a Right Triangle.