cot theta upon cos theta cos theta + sin theta cos theta equals to 1
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We know that
cot
θ
=
cos
θ
sin
θ
Left Hand Side
=
sin
θ
⋅
cot
θ
=
sin
θ
⋅
(
cos
θ
sin
θ
)
=
cos
θ
= Right Hand Side
Hence proved.
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