Answer:
c and a i think
Step-by-step explanation:
An acute triangle is triangle that's less than 90 degree angle and a right triangle is exactly 90 degree angle so
the answer is no, it is not possible
Answer:
1
Step-by-step explanation:
Answer:

Step-by-step explanation:




Answer:
see explanation
Step-by-step explanation:
using the identity
cos2a = 2cos²a - 1 , then
cos2a
= 2[
(a +
) ]² - 1
= 2 [
(a² +
+ 2) ] - 1
=
(a² +
) + 1 - 1
=
(a² +
) ← thus verified