Asked by deb chakraborty

prove alfa+Bita=90 degree,show the maximum value of cos alfa cos bita is 1/2.

Answers

Answered by Steve
that's alpha and beta.
I'll use x and y for ease of typing.

since the angles are complementary, cos(x) = sin(y)

cos(x)*cos(y)
= sin(y)*cos(y)
= 1/2 sin(2y)

since sin has maximum value of 1, ...
Answered by hi
not so good answer
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