Posted by **Jake** on Sunday, January 14, 2007 at 12:38pm.

How do I write arcsin4 in the form a+ib. I know the answer but do not Know how to get to it

Take sinus of both sides:

4 = sin(a)cosh(b) + i cos(a)sinh(b)

Equate real and imaginary parts. You then see that you can put a = pi/2. And it then follows that b = arccosh(4)

Thanks for getting back so promptly , unfortunately i do not what you mean by take sinus of both sides. I have got the stage you have it is the very final stage I van not do

## Answer this Question

## Related Questions

- maths 2 - The original question I had was write arcsin4 in the form a+ib. I ...
- Calculus 12th grade (double check my work please) - 1.)Find dy/dx when y= Ln (...
- Maths - use the formula cos(x+iy)=cosxcosiy-sinxsiniy to find two imaginary ...
- calc: arc length - find the exact length of this curve: y = ( x^3/6 ) + ( 1/2x...
- Mathematics - Trigonometric Identities - Let y represent theta Prove: 1 + 1/tan^...
- calculus - what is the anti-derivative on square root of cosh^2(x)? The square ...
- TRIG! - Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...
- RESPONSE to PreCalc Question - h t t p : / / w w w . j i s k h a . c o m / d i s...
- tigonometry - expres the following as sums and differences of sines or cosines ...
- Trigonometry - Identities and proof - Show that cot((x+y)/2) = - (sin x - sin y...