dhitalbirendra5 dhitalbirendra5

04-04-2021
Mathematics

contestada

show that cos165 + sin165 = cos135

Respuesta :

petersondori petersondori

04-04-2021

cos165° + sin165°
= cos165° + sin(90° - 75°)
= cos165° + cos75°
= 2cos(165° + 75°)/2 * cos(165° - 75°)/2
= 2cos120° cos45°
= 2cos(180° - 60°) * cos(180° - 135°)
= 2 * [- cos60°] * [- cos135°]
= 2 * (-1/2) * (-135°)
= cos135°

Answer Link

Otras preguntas

How do i solve this please help me out!

Combine the words below to make compound words. 1. sand under stand play made home fall paper out water mate field

Tiffany predicts she will earn $42 from the bake sale if Tiffany actually earns $24 what is Tiffany's percent error

A. Name each of the compounds. There are ionic, covalent and acid/base compounds in the list. 1) N2H4 2) PI3 3) LiOH

Simplify 3 square root of 5 end root minus 2 square root of 7 end root plus square root of 45 end root minus square root of 28. 2 square root of 12 2 square

estimate how many 12-inch rulers will be the same length as a rug in your home

What is the purpose of the zigzag line on the periodic table

How do gas laws apply to breathing?

what does this mean du bist besonders

True or false The value 3pi/2 is a solution for the equation 2sin^2x -sin x -1=0