Answer:
A is given by:

Step-by-step explanation:
The base length of the triangle is 4 units shorter than the height.
This means that 
So



The expression for A in terms of h only was given above.
Answer:
12
Step-by-step explanation:
add the tallys
Step-by-step explanation:
cos θ - sin θ = √2 sin θ
cos θ + sin θ = √2 sin θ + 2sin θ
cos θ + sin θ = √2(sin θ + √2sin θ)
cos θ + sin θ = √2 cos θ. (Proven)
Answer:
Step-by-step explanation:
do the thing times 2