body{margin:0;} noscript{z-index: 10000; position: fixed; display: block; height: 100%; width: 100%; background: #fff;} noscript .fa{font-size: 40px; display:block; color: #daa520;} noscript div{margin-top: 6%; padding-left: 20px; padding-right: 20px; text-align: center;} ! You must have JavaScript enabled to use this site.

McGraw Hill Glencoe Algebra 2, 2012

MH

McGraw Hill Glencoe Algebra 2, 2012 View details

2. Verifying Trigonometric Identities

Continue to next subchapter

Exercise 67 Page 885

Consider using the Reciprocal Identity sec θ = 1cos θ.

3/5

Practice makes perfect

We want to find the exact value of cos θ given that sec θ = 53. To do so, we will use one of the Reciprocal Identities. sec θ = 1/cos θ, cos θ ≠ 0 Let's do it!

sec θ = 5/3

sec θ = 1/cos θ

1/cos θ =5/3

LHS * cos θ=RHS* cos θ

1=5/3 cos θ

LHS * 3/5=RHS* 3/5

3/5=cos θ

Rearrange equation

cos θ=3/5

Subchapter links

Check Your Understanding p.882

Practice and Problem Solving p.882-884

H.O.T. Problems p.884

Standardized Test Practice p.885

Spiral Review p.885

Skills Review p.885