Posted by **hasee** on Thursday, April 4, 2013 at 1:53am.

cot^-1(2tan(cos^-18/17))+tan^-1(2tan(sin^-18/17))=tan^-1300/161

- math -
**Reiny**, Thursday, April 4, 2013 at 8:12am
the cos^-18/17 and the sin^-18/17 in your expression don't make sense

did you mean cos^-1 (18/17) ?

in that case, that would be undefined, since no angle exists such that cosØ = 18/17

same thing would be true for the sine part

## Answer This Question

## Related Questions

- Trigonometry - 1.Solve tan^2x + tan x – 1 = 0 for the principal value(s) to two ...
- Trigonometry - Please review and tell me if i did something wrong. Find the ...
- trigonometry help me - 6.Prove that tan y cos^2 y + sin^2y/sin y = cos y + sin ...
- Trigonometry desperate help, clueless girl here - 2. solve cos 2x-3sin x cos 2x...
- Trigonometry - Prove the following trigonometric identities. please give a ...
- precalculus - For each of the following determine whether or not it is an ...
- Trig. - sec^2xcotx-cotx=tanx (1/cos)^2 times (1/tan)-(1/tan)=tan (1/cos^2) times...
- trignonmetry - 6. Prove that tan λ cos^2 λ + sin^2λ/sin λ = ...
- trigonometric function - If sinA=12/13 & tan B=3/4 then find ¡= sin(A+B) &#...
- Pre Cal - could someone please tell me what the other angle identity of tan is? ...

More Related Questions