Answer:
Can You Make the Question Clear Please!?
1/(sin(90 + θ)cos(360 - θ)) - tan²(-θ)
Note:
sin(90 + θ) = cosθ Cosine and Sine are complementary.
cos(360 - θ) = cosθ Cosine positive in 4th quadrant.
tan(-θ) = -tanθ Negative angle concept.
1/(sin(90 + θ)cos(360 - θ)) - tan²(-θ) = 1/(cosθcosθ) - (-tanθ)²
= 1/(cos²θ) - tan²θ
= (1/cosθ)² - tan²θ
Note: 1/cosθ = secθ
= (secθ)² - tan²θ
= sec²θ - tan²θ
= 1
Note that 1+ tan²θ = sec²θ is a Trigonometric identity.
That means: sec²θ - tan²θ = 1
Hope this explains it.
(x-4)(x-3)
FOIL to check
x² -3x -4x +12
x² -7x +12
56 divided by 40 is 1.4. Multiply that by 100 and you get 140.
This is the long way of doing it, but it's the way I've always done it.
Answer:
Step-by-step explanation:
X= Z-4y =9
