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tan(x)= 1/(cos^2(x))

Solución

tan (x) = \frac{1}{cos ^{2} ( x )}

Sin soluci \overset{o}{ˊ} n para x \in R

Pasos de solución

tan (x) = \frac{1}{cos ^{2} ( x )}

Restar

\frac{1}{cos ^{2} ( x )}

de ambos lados

tan (x) - \frac{1}{cos ^{2} ( x )} = 0

Simplificar

tan (x) - \frac{1}{cos ^{2} ( x )} : \frac{cos ^{2} ( x ) tan ( x ) - 1}{cos ^{2} ( x )}

tan (x) - \frac{1}{cos ^{2} ( x )}

Convertir a fracción:

tan (x) = \frac{tan ( x ) cos ^{2} ( x )}{cos ^{2} ( x )}

= \frac{tan ( x ) cos ^{2} ( x )}{cos ^{2} ( x )} - \frac{1}{cos ^{2} ( x )}

Ya que los denominadores son iguales, combinar las fracciones:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{tan ( x ) cos ^{2} ( x ) - 1}{cos ^{2} ( x )}

\frac{cos ^{2} ( x ) tan ( x ) - 1}{cos ^{2} ( x )} = 0

\frac{f ( x )}{g ( x )} = 0 \Rightarrow f (x) = 0

cos^{2} (x) tan (x) - 1 = 0

Re-escribir usando identidades trigonométricas

- 1 + cos^{2} (x) tan (x)

Utilizar la identidad trigonométrica básica:

tan (x) = \frac{sin ( x )}{cos ( x )}

= - 1 + cos^{2} (x) \frac{sin ( x )}{cos ( x )}

cos^{2} (x) \frac{sin ( x )}{cos ( x )} = sin (x) cos (x)

cos^{2} (x) \frac{sin ( x )}{cos ( x )}

Multiplicar fracciones:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{sin ( x ) cos ^{2} ( x )}{cos ( x )}

Eliminar los terminos comunes:

cos (x)

= sin (x) cos (x)

= - 1 + sin (x) cos (x)

Utilizar la identidad trigonométrica del ángulo doble:

2 sin (x) cos (x) = sin (2 x)

sin (x) cos (x) = \frac{sin ( 2 x )}{2}

= - 1 + \frac{sin ( 2 x )}{2}

- 1 + \frac{sin ( 2 x )}{2} = 0

Mover

1

al lado derecho

- 1 + \frac{sin ( 2 x )}{2} = 0

Sumar

1

a ambos lados

- 1 + \frac{sin ( 2 x )}{2} + 1 = 0 + 1

Simplificar

\frac{sin ( 2 x )}{2} = 1

\frac{sin ( 2 x )}{2} = 1

Multiplicar ambos lados por

2

\frac{sin ( 2 x )}{2} = 1

Multiplicar ambos lados por

2

\frac{2 sin ( 2 x )}{2} = 1 \cdot 2

Simplificar

sin (2 x) = 2

sin (2 x) = 2

- 1 \leq sin (x) \leq 1

Sin soluci \overset{o}{ˊ} n para x \in R

arccsc (2 x) = \frac{π}{6}

2 csc (θ) = 2 cot (θ) + 3 csc (θ)

sin (\frac{1}{2} x) = - 1

9 cos^{2} (x) tan (x) = 4 tan (x)

3 tan (x) - 3 = 0, 0 \leq x \leq 2 π