SOLUTION: solve: rad 2 sin D cos D = sin D over the interval [-180degrees, 180 degrees]

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Question 865917: solve: rad 2 sin D cos D = sin D over the interval [-180degrees, 180 degrees]
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
sqrt%282%2Asin%28D%29%2Acos%28D%29%29=sin%28D%29
2%2Asin%28D%29%2Acos%28D%29=sin%5E2%28D%29
sin%5E2%28D%29-2%2Asin%28D%29%2Acos%28D%29=0
sin%28D%29%2A%28sin%28D%29-2cos%28D%29%29=0
Two solutions:
sin%28D%29=0
D=0 and D=180
and
sin%28D%29=2%2Acos%28D%29
tan%28D%29=2
D=tan%5E%28-1%29%282%29
or approximately
D=63.4 and D=243.4