Kpoprocks21 Kpoprocks21

17-06-2016
Mathematics

contestada

Use the half-angle identity to find the exact value of sin 105 degrees.
Please help

Respuesta :

17-06-2016

Hello,

cos 2a=1-2sin²a==>2sin²a=1-cos2a

cos (105°*2)=-cos(30°)=-√3/2
==>2sin²105°=1+√3 /2=(2+√3)/2
==>sin²105°=(2+√3)/4
==>sin 105°=1/2*√(2+√3)

Answer Link

Otras preguntas

Describe how the inner and outer planets are different. Inner planets = Mercury, Venus, Earth, Mars Outer Planets = Jupiter, Saturn, Naptune, Uranus. Be sure to

Does hypertension have any symptoms

In a survey of 2500 registered voters, 1900 of them said that they plan to vote in the next presidential election. Let p denote the proportion of all registered

What is the area of the trapezoid? 6 feet 8 feet 10 feet © 60 f12 80 ft2 (64 ft? 24 ft2

A jar containing 12 brown M&Ms and five yellow M&Ms what is the ratio of yellow M&Ms to brown M&Ms

I need answer please

The trait for rabbit fur follows an inheritance pattern of incomplete dominance. If a rabbit with short fur and a rabbit with long fur mate, what length fur wil

What was an issue that the Knights of Labor experienced? A. They only represented skilled workers. B. All immigrants were skilled laborers. C. They were too big

Write a+5 as a difference.

Three friends share some mangoes as follows;Fred receives 2 out of 5 the total, and the reminder is shared between yaw and kwame in the ratio 3:5. How many mang