Answer:
Step-by-step explanation:
We are to show that 
<u>Proof:</u>
From trigonometry identity;


From trigonometry, 2sinAcosA = Sin2A

Also note that sin(B-C) = sinBcosC - cosBsinC
sin420cos140 - cos420sin140 = sin(420-140)
The resulting equation becomes;

= 
Compare the numbers using <, >, or =. 0.78 ___ 0.708 < > =
Answer:
Step-by-step explanation:
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Answer:
<h2>3. Infinitely many</h2>
Step-by-step explanation:


