sme1rcar6terStar sme1rcar6terStar

14-10-2016
Mathematics

contestada

Use a sum or difference identity to find exact value of sin 255.

Respuesta :

veronicamorgan2 veronicamorgan2

16-10-2016

sin (x + y) = sin x cos y + cos x sin y

sin 255
= sin (210 + 45)
= sin 210 cos 45 + cos 210 sin 45
= (-1/2)(√(2)/2) + (-√(3)/2)(√(2)/2)
= -√(2)/4 + (-√(6)/4)
= -√(2)/4 - √(6)/4
= (-√(2) - √(6)) / 4

Answer Link

Otras preguntas

2x+y=3 -4x-4y=-8 using elimination?

The first square number is 1, and the sum of the first 20 square numbers is 2870. Work out the sum of the first 21 square numbers.

A 48 fluid ounce container orange juice cost $2.40. 60 fluid ounce container of orange juice cost $3.60. Which is the better buy?

Which best describes how the Great Migration affected Northern cities? A.Northern cities changed very little as African Americans moved in. B.Northern cities be

Ty has 2/6 of candy in tom has 3/8 of candy how much candy do they have in all

why do some birds have bright colors while others look more camouflaged

The largest Egyptian pyramid is 146.5 m high. When Nika stands far away from the pyramid, her line of sight to the top of the pyramid forms an angle of elevatio

24 students in Mr. Brown’s homeroom sold 72 magazine subscriptions. 28 students in Mr. Garcia’s homeroom sold 98 magazine subscriptions. Whose homeroom sold mor

Australians stopped using one-cent coins in 1992. Ever since, when they make a purchase, the price is rounded to the nearest five cents. How much money must be

Which statement about Lyndon Johnson's actions as president is true? He tried to continue Kennedy's policies. B. He changed many laws introduced by Kennedy. C.