If cos x=8/17 and 270° < x < 360° what is cos(2x)⁡?

QAmmunity.org

My account
Edit my Profile
Private messages
My favorites

Ask a Question
Questions
Unanswered
Tags
Categories
Ask a Question

asked Apr 25, 2020 171k views

3 votes

If cos x=8/17
and 270° < x < 360°
what is cos(2x)⁡?

Mathematics
high-school

Chares asked

by Chares

8.5k points

0 Comments

Please log in or register to add a comment.

Please log in or register to answer this question.

1 Answer

2 votes

It follows immediately from the double angle identity:

$\cos2x=2\cos^2x-1=-(161)/(289)$

Stephen Lead answered May 2, 2020

by Stephen Lead

7.7k points

0 Comments

Please log in or register to add a comment.

← Prev Question Next Question →

Related questions

asked May 19, 2022 28.9k views

In the interval 0≤x<360° 0 ≤ x < 360 ° , how many values of x x satisfy the equation sin2x=14 sin 2 ⁡ x = 1 4 ?

Nyconing asked May 19, 2022

by Nyconing

8.3k points

Mathematics
college

1 answer

2 votes

28.9k views

asked Apr 17, 2024 205k views

DETAILS MCKTRIG8 5.4.031. MYN For the following, assume that all the given angles are in simplest form, so that if A is in QIV you may assume that 270° < A < 360°. If sin B = - 1 / 1 with B in QIII, find the following. B sin

Tasso Evangelista asked Apr 17, 2024

by Tasso Evangelista

7.9k points

Mathematics
high-school

1 answer

5 votes

205k views

asked Dec 26, 2024 113k views

Given cosθ=3/5 and 270°<θ<360° , find the exact value of each expression. cotθ/2

UVic asked Dec 26, 2024

by UVic

7.7k points

Mathematics
high-school

1 answer

2 votes

113k views

Ask a Question

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.5m questions

12.2m answers

0 Comments

Please log in or register to add a comment.

Please log in or register to answer this question.

1 Answer

0 Comments

Please log in or register to add a comment.

Related questions

Other Questions