taniaorozco taniaorozco

15-07-2018
Mathematics

contestada

If cos x = -4/5, and pi < x < (3pi)/2, what is sin(x + pi/2)

please help and thank you :) xx

Respuesta :

evgeniylevi evgeniylevi

16-07-2018

Try this solution:

note, that sin(pi/2+x)**=cosx, it means sin(x+pi/2)= -4/5.

ps/ ** may be used the formula sin(a+b)=sinacosb+sinbcosa.

Answer Link

Otras preguntas

Name a point that is sqrt(2) away from (-1, 5).

What abbreviation is described in the paragraph? A milliequivalent is a unit of measure used in medication orders and prescriptions, and is abbreviated as ----

When revising a body paragraph in an informative essay, it is important to make sure A) it has a clearly stated main point. B) it is complex and detailed. C) it

What may happen if a large number of computer users are attempting to access a web site at the same time that you are? a. your computer may shut off. b. you m

If Keesha wants to add the phrase "from the library" to describe the book, where should she place it in the sentence below? My sister finished reading the book

Determine the value of the force p which would cause the cabinet to begin to tip. what coefficient ms of static friction is necessary

f(x)=x^4-3x^3+6x^2+2x-60 how many zeros does this function have

The science of sociology is primarily concerned with the creation of an ideal society. True False

Genetic engineering refers to the changing of the genetic makeup of a plant or animal. True False

what was mercantilism in colonial latin america?