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cos(5°) sin(-4°) - cos(4°) sin(5°) = sin( )
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sin(-4)=-sin(4) cos(5°) sin(-4°) - cos(4°) sin(5°) = -cos(5°) sin(4°) - cos(4°) sin(5°) = -(cos(5°) sin(4°) + cos(4°) sin(5°) )= you got it from here, use sin(a+b)=sin(a)cos(b)+sin(b)cos(a)
9?
well, cos(5°) sin(4°) + cos(4°) sin(5°) = sin(9) So, .... -(cos(5°) sin(4°) + cos(4°) sin(5°) )= -sin(9)
or will it be -5+4 so -1
so -9
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sin of -9, not just -9.
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