Answer:
15
Step-by-step explanation:
Answer:
Option D. tan 225° is the correct answer.
Step-by-step explanation:
As we know 
Given in the question angle A = 112.5°
Hence the formula becomes as
Therefore its a formula of tan2(112.5) = tan 225°
Option D. is the correct answer.
Answer:
(- 1, 3 )
Step-by-step explanation:
Given the 2 equations
2x + y = 1 → (1)
3x - y = - 6 → (2)
Adding the 2 equations term by term eliminates the y- term, that is
5x = - 5 ( divide both sides by 5 )
x = - 1
Substitute x = - 1 into either of the 2 equations and evaluate for y
Substituting into (1)
2(- 1) + y = 1
- 2 + y = 1 ( add 2 to both sides )
y = 3
Solution is (- 1, 3 )
A rhombus has 4 equal sides so 21 - x should equal 8x + 3
put them into a simultaneous equation and solve for x
21 - x = 8x + 3
21 - 3 = 8x + x
18 = 9x
x = 18 ÷ 9
x = 2
Answer:
see explanation
Step-by-step explanation:
is an angle in the second quadrant where sin > 0 and cos < 0
cos( )
= cos (π - )
= - cos (
)
= - 
and similarly
sin ( )
= sin ( )
=
