- #1

dr_jack3l

- 7

- 0

1) (tan^2 A)( 1 ) + 1 where A again equals theta

-------- ------

sec^2 A sin

2)1+cos A + sin A

-------- --------

sin A 1+cos A

3) sin A * cot A * csc A

-----

tan A

Ok, so on the first one my understanding is to first change them into just sin/cos. What i did was:

(sin A^2) 1 1

--------- * --------- + ------

(cos A^2) 1 sin A

-----

cos A

from here i think i need to do mult. inv. of the middle to get it to just cos A. This is where i get lost. I want to multiply the first 2 now but I get a huge answer then adding the last term just makes it look horrible.

On the 2nd one, I cross multiplied and I got

(1+cos A)^2 + sin

------------------ = 1

(1+cos A)^2 + sin

On the last one I wrote it out again in cos/sin and got

sin A cos A 1

---------- * --------- * -------

sin A sin A sin A

------

cos A

Trying to solve this I got

cos^2 A

---------

sin^2 A

If someone could please help me understand these and maybe give me a few pointers I'd very much appreciate it. Thanks!