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!
Question 1:
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
Question 2:
Prove the Following algebraically;
Question 3:
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.