Problem of the Day
Find the exact trig value without a calculator
1. csc(45)
2. cos(­ /6)
Problem of the Day
Find the exact trig value without a calculator
1. sec(­225)
2. tan(­ /6)
Problem of the Day
Find the following trigonometric functions using sum and difference formulas.
1. sin(375)
2. cos(165)
Problem of the Day
Find the following angle measures.
1. sin(105)
2. csc(105)
Problem of the Day
Find the following trigonometric functions.
1. tan(195)
7­2 Sum, Difference, and Co­Function Identities
Is sin(x ­ y) = sinx ­ siny????(Try sin(90­45) = sin90 ­ sin45)
cos( /2 ­ x) = ????(use formula)
sin(45 ­ 30) = ?????
Find the exact value using a sum and difference formula.
cos(75)
Find the exact value using a sum and difference formula(use different numbers).
cos(75)
Find the exact value using a sum and difference formula.
cos(105)
Find the exact value using a sum and difference formula.
sin(­15)
Find the exact value using a sum and difference formula.
sin(255)
Find the exact value using a sum and difference formula.
cos(435)
Simplify cos(x ­ 2 )
Simplify sin(x ­ ) Simplify cos(x ­ 3 )
Simplify sin(x ­ /2) Finding exact values
tan(195)
Finding exact values
tan(15)
Finding exact values
tan(­105)
More finding exact values
csc(7 /12)
tan( 13 / 12)
Find cos(x ­ y) and tan(x + y) if....
sinx = 3/5 and cosy = ­ 8/17 and x is in Quadrant II and y is in Quadrant III
Find tan(x + y) if....
sin x = ­8/17 and tan y = ­5/12 and x is in Quadrant III
and y is in Quadrant IV
Practice Problems
Evaluate without a calculator
1. sin55cos25 ­ cos55sin25
2. Homework: pgs 540­541: 1­4,11­18, 21­24, 31­34
sam is awesome
Show all your work. Turn in your homework assignment and Tic­Tac­Toe review with your quiz.
Group Exit Slip(everyone does it and I take 1 for the groups credit)
1. Find the exact value of sin(­120)
2. Verify the identity.
3. Simplify