Differentiate y = x³ + 2x + 1 with respect to x (explicit function).
A
3x²+2
B
x²+2
C
3x+2
D
x³+2
Analysis & Theory
For explicit functions, differentiate directly: dy/dx = 3x² + 2.
Differentiate y = sin x + cos x (explicit function).
A
cos x - sin x
B
sin x + cos x
C
cos x + sin x
D
-cos x - sin x
Analysis & Theory
dy/dx = derivative of sin x (cos x) + derivative of cos x (-sin x) ⇒ dy/dx = cos x - sin x.
Differentiate y = e^(2x) + log x (explicit function).
A
2e^(2x) + 1/x
B
e^(2x) + log x
C
2e^(2x) + x
D
e^(2x)/x
Analysis & Theory
dy/dx = derivative of e^(2x) (2e^(2x)) + derivative of log x (1/x).
If x = t² and y = t³ (parametric equations), find dy/dx.
A
(3/2)t
B
3t²
C
2t
D
t³
Analysis & Theory
dy/dt = 3t², dx/dt = 2t ⇒ dy/dx = (dy/dt)/(dx/dt) = (3t²)/(2t) = (3/2)t.
If x = sin t and y = cos t, find dy/dx.
A
-cot t
B
cot t
C
-tan t
D
sec t
Analysis & Theory
dy/dt = -sin t, dx/dt = cos t ⇒ dy/dx = (-sin t)/(cos t) = -tan t.
If x = a cos t and y = a sin t, find dy/dx.
A
-cot t
B
cot t
C
-tan t
D
-cot t
Analysis & Theory
dy/dt = a cos t, dx/dt = -a sin t ⇒ dy/dx = (a cos t)/(-a sin t) = -cot t.
If x = t and y = t² + 1, find dy/dx.
A
2t
B
t²
C
1
D
2
Analysis & Theory
dy/dt = 2t, dx/dt = 1 ⇒ dy/dx = (2t)/1 = 2t.
If x = e^t and y = e^(2t), find dy/dx.
A
2e^t
B
2e^t
C
2e^t
D
2e^t
Analysis & Theory
dy/dt = 2e^(2t), dx/dt = e^t ⇒ dy/dx = (2e^(2t))/(e^t) = 2e^t.
If x = cos t, y = 1 + sin t, find dy/dx.
A
-tan t
B
-cot t
C
tan t
D
cot t
Analysis & Theory
dy/dt = cos t, dx/dt = -sin t ⇒ dy/dx = cos t / (-sin t) = -cot t.
If x = t² + 1 and y = t³ + 2, find dy/dx.
A
(3t²)/(2t)
B
3t²+2t
C
3t²/2t
D
t²
Analysis & Theory
dy/dt = 3t², dx/dt = 2t ⇒ dy/dx = (3t²)/(2t) = (3/2)t.