Answer:
- 
Step-by-step explanation:
Given 630 < A > 720 then A is in the fourth quadrant where
cosA > 0 and sinA < 0
Given
cosA =
= 
Then the triangle is a 3- 4 - 5 with opposite side 4, thus
sinA = -
= - 
Using the trigonometric identity
sin2A = 2sinAcosA
= 2 × -
× 
=
= - 
Answer:
Answer for that: 13.2 = 8.8 - 4.4
Step-by-step explanation:
10. 12
11. 500
12.8
13.45
Answer:
4. 1/2
5. 9/1
Step-by-step explanation:
4. 2/4 simplifies to 1/2
5. 18/2 simplifies to 9/1