welphygirl1299 welphygirl1299

11-08-2017
Mathematics

contestada

What is the best first step if your plan is to find the exact value of cos 75Â°using the cosine angle sum identity?

Respuesta :

Аноним Аноним

11-08-2017

cos 75 = cos (45 + 30) = cos45 cos30 - sin45 sin30

= 1/ sqrt2 * sqrt3/2 - 1/ sqrt2 * 1/2

= sqrt3 / 2 sqrt2 - 1 / 2 sqrt2

= sqrt3 - 1
-------------
2 sqrt2

Answer Link

Otras preguntas

What was an immediate impact of Black Tuesday?

U.S. residents who are not citizens may not A) serve on juries B) location of birth C)resident alien D) naturalization

What causes chronic strains? A -- dehydration B -- improper lifting C -- sudden injury D -- repetitive motion

Keith is observing a slide of an amoeba under a compound microscope. He places a stained fine particle of yeast near the amoeba. He observes that the amoeba is

what is the value of x in the equation 2x + 3y = 36 when y = 6

Sarah has always been on time every time I meet her for dinner. Therefore, she will be on time tonight when we meet for dinner. Is the argument above inductive

What was the capital of the eastern Roman Empire?

what happens to a liquid when it releases enough energy

A way that the United States began its policy of providing aid to Sudan was by

Who is known as the Father of Medicine?