taja19 taja19
  • 12-08-2019
  • Mathematics
contestada

Simplify the expression by using a double-angle formula.
cos-39°– sin²39

Respuesta :

Аноним Аноним
  • 13-08-2019

Answer:

cos 78⁰.

Step-by-step explanation:

Use cos 2A = cos^2 A - sin^2 A

so cos^2 39 - sin^2 39 = cos (2*39) = cos 78.

Answer Link

Otras preguntas

I need help plz WILL GIVE BRAINLIEST
an item costs 4 dollars before tax and 4.32 after sales tax what is the sales tax rate
what kind of angle does an acute triangle have​
9. What does energy efficiency mean? A. How much useful work we can get from each unit of energy used B. How fast the energy can be expended C. The maximum amou
What are the implications of being characterized this way? Why do media portrayals of your generation matter? For example, do you think they affect what product
WILL GIVE BRANLIEST!! EASY BUT I WAS TO LAZY TO LEARN!! WILL FOREVER BE GREATFUL!!! WILL GIVE BRANLIEST!! EASY BUT I WAS TO LAZY TO LEARN!! WILL FOREVER BE GREA
Show the work for 3-(-4)
Which text would best help you better understand Bindi's message of wildlife conservation?
Has she not cheated anybody? Change into passive voice
20, 21, 28 acute obtuse right​