Root 3 cosec140° - sec140°=4
prove that

Step-by-step explanation:

We are to show that

Proof:

From trigonometry identity;

From trigonometry, 2sinAcosA = Sin2A

Also note that sin(B-C) = sinBcosC - cosBsinC

sin420cos140 - cos420sin140 = sin(420-140)

The resulting equation becomes;

=

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