First of all, observe that all fractions exist as long as b is not zero.
Multiply both numerator and denominator of the first fraction by 3:

Now all fractions have the same denominator. Under the assumption that b is not zero, multiply both sides by 3b:

Subtract 3b from both sides:

Subtract 2 from both sides:

Divide both sides by 2:

Answer:
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Answer:
Need more info
Step-by-step explanation:
False- the included angle must be a right angle for cos C to be 0 & two other points are normally used
Multiply 3 and 8 then you will have your answer