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(1+sinA)2 -(1-sinA)2=4sinA ​
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(1+sinA)2 -(1-sinA)2=4sinA

​

User Kenesha
by
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1 Answer

4 votes

Expand the binomials.


(x+y)^2 - (x-y)^2 = (x^2 + 2xy + y^2) - (x^2 - 2xy + y^2) = 4xy

Now let
x=1 and
y=\sin(A).

User Secondflying
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