Find the exact value, without a calculator.
710
6
sin
2
tan
12
6
2
7Tt/6
COS

Step-by-step explanation:

First consider numerator

Using the formula : sin (A + B) = sin A cos B + cos A sin B

Second consider denominator

Using the formula : cos (A + B) = cos A cos B - sin A sin B

Therefore,

Either we can stop here or Rationalize the denominator:

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it

proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc