Wednesday

August 20, 2014

August 20, 2014

Posted by **Dylan** on Sunday, November 15, 2009 at 9:13pm.

I'll answer your question...

ok instructions to this problem

In problems 77-88, use properties of the trigonmetric functions to find the exact value of each expression. Do not use a calculator

85. sin(-pi/12)csc( (25 pi)/12 )

book dosen't say weather or not if it's in radians but I assume it is...

Ok I just put it into my calculator and got negative one I'm in radian mode...

Here's what I put in my calculator...

(sin(-pi/12))/(sin((25pi)/12))

My back of the book, sense this is an odd problem gives me also -1 here's why...

when you added pi to the denomenator you forgot to make it negative...

this would give you negative one

ok

I have a question

why is sin(-20)/cos 380

= to tan of -200

I know sin over cos is tan just don't see were the -200 came from thanks!

- Pre Calculus -
**Dylan**, Sunday, November 15, 2009 at 9:16pmsee...

(- sin pi/12 + pi)/(sin (25 pi)/12 + pi)

this becomes

(sin pi/12 + pi)/(-sin (25 pi)/12 + pi)

finish it off and you get negative one...

why is sin(-20)/cos(380) equal to tan(-200)

I don't understand

**Related Questions**

pre calculus - Use properties of logarithms to find the exact value of the ...

pre calculus - Having a bit of a problem with this for the given functions f, g ...

Pre Calc - use properties of the trigonometric function to find the exact value ...

Pre-Calculus - Find the inverse function for the function f(x)=2^(x)+1/2^(x)-1 ...

CALCULUS - If cos(t)=–7/9, find the values of the following trigonometric ...

Pre-Calculus - The exponential function y(x)=Ce^ax satisfies the conditions y(0...

Pre-Calculus-check answers - Use a sum or difference identity to find the exact ...

calculus - Use the even odd properties to find the exact value of the expression...

HELP WITH MATH - Sorry the caps lock was on. Can you help me with this pre ...

Pre calculus - How do you work this problem? Find the exact value of sin 2u, cos...