Prove the identity.
= 
What will be an ideal response?
Using the sum and difference identities, 
= 
= 
= 
= 
= 
You might also like to view...
Solve the problem.The foundation for a cylindrical fountain is a cylinder 29 yd in diameter and 5 yd high. How many cubic yd of concrete are needed to build the foundation (to the nearest hundredth)?
A. 13,203.70 yd3 B. 6601.85 yd3 C. 910.60 yd3 D. 3300.93 yd3
Find an equation of the ellipse.An ellipse with y-intercepts ±6; foci at 
and 
.
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Find the future value of the annuity due. Assume that interest is compounded annually, unless otherwise indicated.$800 deposited at the beginning of each year for 11 years at 5% compounded annually
A. $10,565.43 B. $9262.31 C. $11,933.70 D. $26,565.43
Find the indicated cross product.v = 3i - 2j + 2k, w = -2i - 5j + 3kFind w × v.
A. -4i + 13j + 19k B. -11i + 12j + 16k C. 19i + 4j - 4k D. -13i + 4j + 19k