Find the exact value of tan pi/4

1.4×10^-2

Step-by-step explanation:

Tanpi/4

Pi could be either 22/7 or 3.142

So any of these can be chosen

Pi = 3.142

Pi/4= 3.142/4

=0.7854

Tan 0.7854

= 0.0137

=1.4×10^-2

Step-by-step explanation:

We'll use the half angle identity for tangent along with the unit circle to find the exact value of tan(π / 4).  There are 3 half angle identities for tangent, but I chose this one (just because!):

We just need to find the angle to replace theta.  It will be

because

Filling in:

Here's where we'll look to the unit circle to find that the

 and   so filling those values in gives us:

so the exact value of

i dont get it. where are the "descriptions"?

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.