Prove the identity.cos 2y = 

What will be an ideal response?

 = 
  =  
  = 
  =  Using the Pythagorean identity 
  = cos2 y - sin2 y
  = cos 2y Using the double-angle identity 

Mathematics

You might also like to view...

Find the volume area of the figure. Use 3.14 for ?. Round the answer to the nearest hundredth when appropriate.

A. 226.08 cu. ft B. 452.16 cu. ft C. 113.04 cu. ft D. 1808.64 cu. ft

View
Mathematics

Fill in the blank with the correct inequality symbol.If x < 2, then x - 2  0.

A. ? B. < C. > D. ?

View
Mathematics

Write each whole number in expanded form.19,865

A. 50,000 + 6000 + 800 + 90 + 1 B. 1000 + 900 + 80 + 65 C. 19,865 D. 10,000 + 9000 + 800 + 60 + 5

View
Mathematics

Simplify the complex fraction.7 - 

A. 5
B. - 
C.
D. - 5

View
Mathematics