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

what are some forms of self harm

solve this sum. ....

Please label the words to the correct box :D you will get good points ;)

In the modern time school is declared as a peace zone area . But school are freguently closed due to the different issue and stracts . In your view what should

I need help please provide the steps

Smokecity, Inc., manufactures barbeque smokers. Based on past experience, smoke city has found that it’s total annual overhead costs can be represented by the f

A bakery made 100 donuts. In the display case, 40/100 were chocolate, 3/10 were glazed, and the rest were cinnamon. Which fraction of the donuts were cinnamon?

What similarity does the official between Campion right in the final paragraph

Given that 3x : 10 = 5: 2 Calculate the value of x. Give your answer in its simplest form. X =

What is the process of writing a number as a product of several factors