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1 answer:
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Answer:
--- Never true
--- Always true
---- Sometimes true
---- Sometimes true
Step-by-step explanation:
Given
Required
Determine if the following expression is always, sometimes of never true
Expand using cosine rule
So, we have:
Hence: (a) is never true
Expand using cosine rule
So, we have:
Hence: (b) is always true
If
Then:
Divide both sides by 2
(c) is only true for
Hence: (c) is sometimes true
If
Then:
Divide both sides by 2
(d) is only true for
Hence: (d) is sometimes true
Answer:
A
Step-by-step explanation:
So we have the equation:
Subtract 4 from both sides:
Divide both sides by -8:
And we're done!
The answer is A