Answer:
c=80
Step-by-step explanation:
Answer:

Step-by-step explanation:
Formula =======================
<em>consider a and b two real numbers </em>
<em>where a > 0 and b > 0.</em>

……………………………………………………………
log 3 − log 15



Answer:
2 - sqrt(3)
Step-by-step explanation:
Split pi/12 into two angles where the values of the six trigonometric functions are known.
tan (pi/4 - pi/6)
Apply the difference of angles identity

tan(pi/4) = 1 , tan(pi/6) = (sqroot3)/3
Plug in and Simplify



Need to multiply this by 
Expand and simplify numerator: 
Expand and simplify denominator: 
Cancel the common factor: 