What is the general solution for (1+csc(A))(1-csc(A))=-cot(A) ?

The general solution for (1+csc(A))(1-csc(A))=-cot(A) is A= pi/2+pin,A= pi/4+pin

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(1+csc(A))(1-csc(A))=-cot(A)

Solution

(1 + csc (A)) (1 - csc (A)) = - cot (A)

Solution

A = \frac{π}{2} + πn, A = \frac{π}{4} + πn

Degrees

A = 9 0^{\circ} + 18 0^{\circ} n, A = 4 5^{\circ} + 18 0^{\circ} n

Solution steps

(1 + csc (A)) (1 - csc (A)) = - cot (A)

Subtract

- cot (A)

from both sides

(1 + csc (A)) (1 - csc (A)) + cot (A) = 0

Rewrite using trig identities

cot (A) + (1 + csc (A)) (1 - csc (A))

(1 + csc (A)) (1 - csc (A)) = - cot^{2} (A)

(1 + csc (A)) (1 - csc (A))

Expand

(1 + csc (A)) (1 - csc (A)) : 1 - csc^{2} (A)

(1 + csc (A)) (1 - csc (A))

Apply Difference of Two Squares Formula:

(a + b) (a - b) = a^{2} - b^{2}

a = 1, b = csc (A)

= 1^{2} - csc^{2} (A)

Apply rule

1^{a} = 1

1^{2} = 1

= 1 - csc^{2} (A)

= 1 - csc^{2} (A)

Use the Pythagorean identity:

csc^{2} (A) = 1 + cot^{2} (A)

csc^{2} (A) - 1 = cot^{2} (A)

= - cot^{2} (A)

= cot (A) - cot^{2} (A)

cot (A) - cot^{2} (A) = 0

Solve by substitution

cot (A) - cot^{2} (A) = 0

Let:

cot (A) = u

u - u^{2} = 0

u - u^{2} = 0 : u = 0, u = 1

u - u^{2} = 0

Write in the standard form

a x^{2} + b x + c = 0

- u^{2} + u = 0

Solve with the quadratic formula

- u^{2} + u = 0

Quadratic Equation Formula:

For

a = - 1, b = 1, c = 0

u_{1, 2} = \frac{- 1 \pm 1 ^{2} - 4 ( - 1 ) \cdot 0}{2 ( - 1 )}

u_{1, 2} = \frac{- 1 \pm 1 ^{2} - 4 ( - 1 ) \cdot 0}{2 ( - 1 )}

1^{2} - 4 (- 1) \cdot 0 = 1

1^{2} - 4 (- 1) \cdot 0

Apply rule

1^{a} = 1

1^{2} = 1

= 1 - 4 (- 1) \cdot 0

Apply rule

- (- a) = a

= 1 + 4 \cdot 1 \cdot 0

Apply rule

0 \cdot a = 0

= 1 + 0

Add the numbers:

1 + 0 = 1

= 1

Apply rule

1 = 1

= 1

u_{1, 2} = \frac{- 1 \pm 1}{2 ( - 1 )}

Separate the solutions

u_{1} = \frac{- 1 + 1}{2 ( - 1 )}, u_{2} = \frac{- 1 - 1}{2 ( - 1 )}

u = \frac{- 1 + 1}{2 ( - 1 )} : 0

\frac{- 1 + 1}{2 ( - 1 )}

Remove parentheses:

(- a) = - a

= \frac{- 1 + 1}{- 2 \cdot 1}

Add/Subtract the numbers:

- 1 + 1 = 0

= \frac{0}{- 2 \cdot 1}

Multiply the numbers:

2 \cdot 1 = 2

= \frac{0}{- 2}

Apply the fraction rule:

\frac{a}{- b} = - \frac{a}{b}

= - \frac{0}{2}

Apply rule

\frac{0}{a} = 0, a \neq = 0

= - 0

= 0

u = \frac{- 1 - 1}{2 ( - 1 )} : 1

\frac{- 1 - 1}{2 ( - 1 )}

Remove parentheses:

(- a) = - a

= \frac{- 1 - 1}{- 2 \cdot 1}

Subtract the numbers:

- 1 - 1 = - 2

= \frac{- 2}{- 2 \cdot 1}

Multiply the numbers:

2 \cdot 1 = 2

= \frac{- 2}{- 2}

Apply the fraction rule:

\frac{- a}{- b} = \frac{a}{b}

= \frac{2}{2}

Apply rule

\frac{a}{a} = 1

= 1

The solutions to the quadratic equation are:

u = 0, u = 1

Substitute back

u = cot (A)

cot (A) = 0, cot (A) = 1

cot (A) = 0, cot (A) = 1

cot (A) = 0 : A = \frac{π}{2} + πn

cot (A) = 0

General solutions for

cot (A) = 0

cot (x)

periodicity table with

πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} cot (x) \mp \infty 31 \frac{3}{3} 0 - \frac{3}{3} - 1 - 3

A = \frac{π}{2} + πn

A = \frac{π}{2} + πn

cot (A) = 1 : A = \frac{π}{4} + πn

cot (A) = 1

General solutions for

cot (A) = 1

cot (x)

periodicity table with

πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} cot (x) \mp \infty 31 \frac{3}{3} 0 - \frac{3}{3} - 1 - 3

A = \frac{π}{4} + πn

A = \frac{π}{4} + πn

Combine all the solutions

A = \frac{π}{2} + πn, A = \frac{π}{4} + πn

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Frequently Asked Questions (FAQ)

What is the general solution for (1+csc(A))(1-csc(A))=-cot(A) ?
The general solution for (1+csc(A))(1-csc(A))=-cot(A) is A= pi/2+pin,A= pi/4+pin