Home › AP EAPCET (Engineering) › Mathematics › Trigonometry: Hyperbolic Functions › If tanh x = 5/13, what is sech x for positive x?
If tanh x = 5/13, what is sech x for positive x?
A5/12
B13/12
C12/13
D8/13
Answer & Solution
Correct answer: C. 12/13
sech^2 x = 1 - 25/169 = 144/169, so sech x = 12/13.
Related questions
The expression (cosh x - 1)/sinh x equals which half-argument value?The sum sinh x + sinh y is the same as 2 sinh((x + y)/2) multiplied by what?Raising cosh x + sinh x to the third power gives which expression?In the complex plane, the hyperbolic tangent and the other derived hyperbolic functions arWhich function links circular and hyperbolic functions without using complex numbers?If c' = s and s' = c with s(0) = 0 and c(0) = 1, then s(x) equals what?Which function f solves f' = 1 - f² with f(0) = 0?In special relativity, hyperbolic functions are used to express which kind of transformati