Plz show that

Solution:

The formula for tan(A+B) and tan(A-B) are:

The left hand side of the given expression is:

Using the formula above and value of tan(π/4) = 1, we can expand this expression as:

Thus, the left hand side is proved to be equal to right hand side.

80 the answer is 80

step-by-step explanation:

yes

step-by-step explanation:

so of course you want to start by plugging the 5 in which goes to 7(5)+3(5)=50 because 7*5=35 and 3*5=15 and then add them together, then plug in the 5 to the other equation as well 9(5)+5=50 because 9*5= 45 and then add 5 and so yes they are equivalent.