emiliefowkes emiliefowkes

26-05-2020
Mathematics

contestada

If im given cos81 = 0.1564, how do i evaluate other cosines without a calculator? Like cos99 and cos279 for example.

Respuesta :

ronhagrid310 ronhagrid310

26-05-2020

Answer:

As property of trigonometry:

cos x = - cos(180 - x)

=> cos 99 = - cos(180 - 99) = - cos 81 = - 0.1564

cos x = cos(360 - x)

=> cos 279 = cos(360 - 279) = cos 81 = 0.1564

Hope this helps!

:)

Answer Link

Otras preguntas

How can awareness of one's and others' needs lead to healthy decision making so that bias and violence do not escalate?

How long did Nil Armstrong stay on the moon

Explain how scientists are able to estimate the age of the solar system. They use radioactive dating with samples of meteorites. They use relative dating with t

Which statement best describes a physical change? 1 Changes can occur to certain chemical properties of the substance, but the overall shape of the substance wi

what is an example of a prokaryote that does binary fission?

6 LA 3 2 1 -6 -5 -4 -3 -2 - 1 1 2 3 4 - 1 N- -2 What is the slope of line segment AB? A NIN B) 3 4 o 4 3 D IN

WILL GIVE BRAINLIEST A florist has 75 tulips with which to make bouquets. She will use 12 tulips in each bouquet. If the florist ends up with 3 tulips left, ho

show the solution 4-2x>7+x

Find a point E on CD such that the ratio of CE to CD is [tex]\frac{3}{8}[/tex].

Nick will apply for a business loan for his toy company. The loan officer asked Nick to determine the company's current value and growth for the next few years.