Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 8: Q. 23 (page 516)

Find the exact value of the expression-

1-cos220°-cos270°

Short Answer

Expert verified

The required value is,

1-cos220°-cos270°=0

Step by step solution

01

Step 1. Given information

Given expression

1-cos220°-cos270°

02

Step 2. Calculation

Solving the given expression,

1-cos220°-cos270°=sin220°-cos270° ---------{sin2θ+cos2θ=1}

localid="1647102453546" =sin290°-70°-cos270°=cos270°-cos270°=0 ----------{sin90°-θ=cosθ}

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Time Lost due to a Navigation Error In attempting to fly from city P to city Q, an aircraft followed a course that was 10° in error, as indicated in the figure. After flying a distance

of 50 miles, the pilot corrected the course by turning at point R and flying 70 miles farther. If the constant speed of the aircraft was 250 miles per hour, how much time was lost due

to the error?

Find an exact value of each expression, without using a calculatorcos240+cos250

Find an exact value of each expression, without using a calculatorcos62-sin28

In the given problem solve the triangle using either the law of sines or law of cosines-

A=10°,a=3,b=10

Great Pyramid of Cheops One of the original Seven Wonders of the World, the Great Pyramid of Cheops was built about 2580 bc. Its original height was 480 feet 11 inches,

but owing to the loss of its topmost stones, it is now shorter. Find the current height of the Great Pyramid using the information given in the illustration.
See all solutions

Recommended explanations on Math Textbooks

Mechanics Maths

Read Explanation

Statistics

Read Explanation

Geometry

Read Explanation

Logic and Functions

Read Explanation

Discrete Mathematics

Read Explanation

Probability and Statistics

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free