Cos α = sin (90-α) so cos 19 = sin 90-19 = sin 71
Answer:
The answer to your question is: third option is correct
Step-by-step explanation:
According to the graph we can see that the points where both lines crosses are:
A (4, 8) and B (-4, 0)
Answer:
θ =
(60° )
Step-by-step explanation:
Using the identity
sin²x + cos²x = 1 ⇒ sin²x = 1 - cos²x
Given
cos²θ - sin²θ = 2 - 5cosθ
cos²θ - (1 - cos²θ) = 2 - 5cosθ
cos²θ - 1 + cos²θ = 2 - 5cosθ
2cos²θ - 1 = 2 - 5cosθ ( subtract 2 - 5cosθ from both sides )
2cos²θ + 5cosθ - 3 = 0 ← in standard form
(cosθ + 3)(2cosθ - 1) = 0 ← in factored form
Equate each factor to zero and solve for θ
cosθ + 3 = 0
cosθ = - 3 ← not possible as - 1 ≤ cosθ ≤ 1
2cosθ - 1 = 0
cosθ =
, so
θ =
(
) =
( or 60° )
Answer:
well using your equation p - 18 = 0.85p the answer is p = 120
when u apply p = 120 to your equation
(120) - 18 = 0.85(120)
simplify
102 = 102
I hope this helps you