Use trigonometric identities to transform the left side of the equation into the right side (0 < θ < π/2).
(1 + cos(θ))(1 − cos(θ))

= 

= 
sin^{2}(θ)

Given trigonometric identity is:
We need to show that, left side transform to right side.
Take left side
Multiply both the factors using foil method.
FOIL stands for First, Outer, Inner, Last.
We have an ide...
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