Help with this trig identity! Urgent!

To all helpers. I got a private message from this poster whom I actually responded to. He did not like my explanation and was quite rude to me. I ask that no one helps this poster. Thanks.
 
To all helpers. I got a private message from this poster whom I actually responded to. He did not like my explanation and was quite rude to me. I ask that no one helps this poster. Thanks.
I do not respond to PMs from "unknown" sender - as a matter of principle.

If the student cannot post the problem in a "public" forum - where the response could help many students - then s/he should hire a private tutor.
 
To all helpers. I got a private message from this poster whom I actually responded to. He did not like my explanation and was quite rude to me. I ask that no one helps this poster. Thanks.
I minimally responded before your response? came up. Sorry about that.
 
lol his response contained no actual content but rather passive aggression because I did not word my question correctly. Which should be expected from a "mathhelp" forum.
 
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