SOLUTION: sin5A/sinA-cos5A/cosA=4cos2A prove that...

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Question 1140218: sin5A/sinA-cos5A/cosA=4cos2A
prove that...
Answer by Edwin McCravy(20060) About Me  (Show Source):
You can put this solution on YOUR website!
sin%285A%29%2Fsin%28A%29-cos%285A%29%2Fcos%28A%29=4cos%282A%29

Work with only the left side:

sin%285A%29%2Fsin%28A%29-cos%285A%29%2Fcos%28A%29

%28sin%285A%29cos%28A%29-cos%285A%29sin%28A%29%29%2F%28sin%28A%29cos%28A%29%29

%28sin%284A%29%29%2F%28sin%28A%29cos%28A%29%29

%282sin%284A%29%29%2F%282sin%28A%29cos%28A%29%29

%282sin%284A%29%29%2F%28sin%282A%29%29

%282%282sin%282A%29cos%282A%29%29%29%2F%28sin%282A%29%29

%284sin%282A%29cos%282A%29%29%2F%28sin%282A%29%29

%284cross%28sin%282A%29%29cos%282A%29%29%2F%28cross%28sin%282A%29%29%29

4cos%282A%29

Edwin