For the first one.
Now apply the identity
I am doing a non-credit assignment and would like to check my answers to see if I have done them correctly, If you can provide help, show steps and/or show me final answer to the following questions it would greatly assist me to see if I am doing these correctly, Thank you!
The exact value of cos(105) can be determined using the sum and difference identities. Determine the exact value of cos(105) and express the answer in the form
Prove the Following algebraically;
Solve the following equation for x, where
Write tanx as sinx/cosx, cscx as 1/sinx and cotx as cosx/sinx. Then multiply top and bottom by sinxcosx.
Should then get sin^2x/cox-cos^2x. Now write sin^2x as 1-cos^2x which factorises to (1-cosx)(1+cosx). Also factorise cosx-cos^2x into cosx(1-cosx). You should see that (1-cosx) cancels out and get the result.