Use the properties of the trigonometric functions to find the exact value of the expression. Do not use a calculator.sec2 20° - tan2 20°
A. 2
B. 1
C. -1
D. 0
Answer: B
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Evaluate the root, if possible.
A. 
B. 
C. 
D. 
Find the partial derivative of the dependent variable or function with respect to each of the independent variables.f(x, y) = sin2 (4xy2 - y)
A. 
= 8y2sin (4xy2 - y) cos (4xy2 - y); 
= 2sin (4xy2 - y) cos (4xy2 - y)
B. 
= 8y2sin (4xy2 - y) cos (4xy2 - y); 
= (16xy - 2) sin (4xy2 - y) cos (4xy2 - y)
C. 
= 2sin (4xy2 - y) cos (4xy2 - y); 
= 2sin(4xy2 - y) cos(4xy2 - y)
D. 
= 2sin (4xy2 - y) cos (4xy2 - y); 
= (16x - 2) sin (4xy2 - y) cos (4xy2 - y)
Provide an appropriate response.Find the product: (3m - n)(4m - 3n)
What will be an ideal response?
Find the area of the figure below. (The area of a rectangle is the product of its length and width. The area of a triangle is 
the product of its base and height.)
A. 3
sq. cm
B. 1
sq. cm
C. 2
sq. cm
D. 4
sq. cm