sin(3A) = sin(2A + A) = sin(2A)*cos(A) + cos(2A)*sin(A)= sin(A+A)*cos(A) + cos(A+A)*sin(A)
= 2*sin(A)*cos(A)*cos(A) + {cos^2(A) - sin^2(A)}*sin(A)
= 2*sin(A)*cos^2(A) + sin(a)*cos^2(A) - sin^3(A)
= 3*sin(A)*cos^2(A) - sin^3(A)
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Cannot prove that 2 divided by 10 equals 2 because it is not true.
a0=(a-1\a-1)=a\a=1
It is extremely difficult to prove things which are not true.
You can't prove it, because it's usually not true.The only time it's true is when x=0 .
that cannot be proved because it is not necessarily true.