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Consider the closed curve between 0 <= theta < 2pi given by r(theta) = 6 + alpha sin theta, where alpha is some real constant strictly between 0 and 6. The area in this closed curve is 97pi/2. Calculate the value of alpha.

Student uses the definition of area [A = 1/2 integral r(theta)^2 d theta], and proceeds using standard integration techniques to give a quadratic solvable for alpha. [alpha^2 = 25] Thus, alpha = 5.

GC
Answered by Graham C. Maths tutor
3264 Views

The curve C has equation 2yx^2 + 2x + 4y - cos(πy) = 45. Using implicit differentiation, find dy/dx in terms of x and y

2x2y + 2x + 4y - cos(πy) = 45Applying implicit differentiation:4xy + 2x2(dy/dx) + 2 + 4(dy/dx) + πsin(πy)(dy/dx) = 0Moving all (dy/dx) terms to one side:2x2 (dy/dx) + 4(dy...

PM
Answered by Prahlad M. Maths tutor
5368 Views

Find the integral of [ 2x^4 - (4/sqrt(x) ) + 3 ], giving each term in its simplest form

We begin by rewriting it in a more workable form: 2x4 - 4x-1/2 + 3. Indices are easier to integrate than fractions.Now, we integrate each term separately. The first term is 2x4...

PM
Answered by Prahlad M. Maths tutor
4237 Views

y = p x q^(x - 1), When x = 1, y = 10, and when x = 6, y = 0.3125. Find the value of 'y' when x = 3

When x = 1, y = 10Therefore, p x q(1 - 1) = 10 p x q0 = 10 p x 1 = 10, p = 10When x = 6, y = 0.3125 p x q(6 - 1)= 0.3125 10 x q5 = 0.3125 q5 = 0.0312...

PM
Answered by Prahlad M. Maths tutor
8745 Views

Write 16 × 8^2x as a power of 2 in terms of x

16 = 42 = (22)2 = 248 = 23 , therefore 82x = 23(2x) = 26x24 x 26x = 24 + 6x

PM
Answered by Prahlad M. Maths tutor
5868 Views

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