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Popular >

tan(t)-tan^2(2)+sec^3(t)>0

Solution

tan (t) - tan^{2} (2) + sec^{3} (t) > 0

Solution

False for all t \in R

Solution steps

tan (t) - tan^{2} (2) + sec^{3} (t) > 0

Periodicity of

tan (t) - tan^{2} (2) + sec^{3} (t) : 2 π

The compound periodicity of the sum of periodic functions is the least common multiplier of the periods

tan (t), sec^{3} (t)

Periodicity of

tan (t) : π

Periodicity of

tan (x)

π

= π

Periodicity of

sec^{3} (t) : 2 π

Periodicity of

sec^{n} (x) =

Periodicity of

sec (x),

if n is odd

Periodicity of

sec (t) : 2 π

Periodicity of

sec (x)

2 π

= 2 π

2 π

Combine periods:

π, 2 π

= 2 π

Express with sin, cos

tan (t) - tan^{2} (2) + sec^{3} (t) > 0

Use the basic trigonometric identity:

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

\frac{sin ( t )}{cos ( t )} - tan^{2} (2) + sec^{3} (t) > 0

Use the basic trigonometric identity:

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

\frac{sin ( t )}{cos ( t )} - (\frac{sin ( 2 )}{cos ( 2 )})^{2} + sec^{3} (t) > 0

Use the basic trigonometric identity:

sec (x) = \frac{1}{cos ( x )}

\frac{sin ( t )}{cos ( t )} - (\frac{sin ( 2 )}{cos ( 2 )})^{2} + (\frac{1}{cos ( t )})^{3} > 0

\frac{sin ( t )}{cos ( t )} - (\frac{sin ( 2 )}{cos ( 2 )})^{2} + (\frac{1}{cos ( t )})^{3} > 0

Simplify

\frac{sin ( t )}{cos ( t )} - (\frac{sin ( 2 )}{cos ( 2 )})^{2} + (\frac{1}{cos ( t )})^{3} : \frac{cos ^{2} ( 2 ) cos ^{2} ( t ) sin ( t ) - sin ^{2} ( 2 ) cos ^{3} ( t ) + cos ^{2} ( 2 )}{cos ^{2} ( 2 ) cos ^{3} ( t )}

\frac{sin ( t )}{cos ( t )} - (\frac{sin ( 2 )}{cos ( 2 )})^{2} + (\frac{1}{cos ( t )})^{3}

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

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

Apply exponent rule:

(\frac{a}{b})^{c} = \frac{a ^{c}}{b ^{c}}

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

(\frac{1}{cos ( t )})^{3} = \frac{1}{cos ^{3} ( t )}

(\frac{1}{cos ( t )})^{3}

Apply exponent rule:

(\frac{a}{b})^{c} = \frac{a ^{c}}{b ^{c}}

= \frac{1 ^{3}}{cos ^{3} ( t )}

Apply rule

1^{a} = 1

1^{3} = 1

= \frac{1}{cos ^{3} ( t )}

= \frac{sin ( t )}{cos ( t )} - \frac{sin ^{2} ( 2 )}{cos ^{2} ( 2 )} + \frac{1}{cos ^{3} ( t )}

Least Common Multiplier of

cos (t), cos^{2} (2), cos^{3} (t) : cos^{2} (2) cos^{3} (t)

cos (t), cos^{2} (2), cos^{3} (t)

Lowest Common Multiplier (LCM)

Compute an expression comprised of factors that appear in at least one of the factored expressions

= cos^{2} (2) cos^{3} (t)

Adjust Fractions based on the LCM

Multiply each numerator by the same amount needed to multiply its

corresponding denominator to turn it into the LCM

cos^{2} (2) cos^{3} (t)

For

\frac{sin ( t )}{cos ( t )} :

multiply the denominator and numerator by

cos^{2} (2) cos^{2} (t)

\frac{sin ( t )}{cos ( t )} = \frac{sin ( t ) cos ^{2} ( 2 ) cos ^{2} ( t )}{cos ( t ) cos ^{2} ( 2 ) cos ^{2} ( t )} = \frac{sin ( t ) cos ^{2} ( 2 ) cos ^{2} ( t )}{cos ^{2} ( 2 ) cos ^{3} ( t )}

For

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

multiply the denominator and numerator by

cos^{3} (t)

\frac{sin ^{2} ( 2 )}{cos ^{2} ( 2 )} = \frac{sin ^{2} ( 2 ) cos ^{3} ( t )}{cos ^{2} ( 2 ) cos ^{3} ( t )}

For

\frac{1}{cos ^{3} ( t )} :

multiply the denominator and numerator by

cos^{2} (2)

\frac{1}{cos ^{3} ( t )} = \frac{1 \cdot cos ^{2} ( 2 )}{cos ^{3} ( t ) cos ^{2} ( 2 )} = \frac{cos ^{2} ( 2 )}{cos ^{2} ( 2 ) cos ^{3} ( t )}

= \frac{sin ( t ) cos ^{2} ( 2 ) cos ^{2} ( t )}{cos ^{2} ( 2 ) cos ^{3} ( t )} - \frac{sin ^{2} ( 2 ) cos ^{3} ( t )}{cos ^{2} ( 2 ) cos ^{3} ( t )} + \frac{cos ^{2} ( 2 )}{cos ^{2} ( 2 ) cos ^{3} ( t )}

Since the denominators are equal, combine the fractions:

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

= \frac{sin ( t ) cos ^{2} ( 2 ) cos ^{2} ( t ) - sin ^{2} ( 2 ) cos ^{3} ( t ) + cos ^{2} ( 2 )}{cos ^{2} ( 2 ) cos ^{3} ( t )}

= No Solution for t \in R

False for all t \in R

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