On the unit circle, where 0 < theta < or equal to 2pi, when is tan theta undefined? a. theta=pi and theta=2pi b. sin theta = cos theta c. theta = pi/2 and theta=3pi/2 d. sin theta = 1/cos theta answer within 5 minutes, this is timed.

The tangent is the slope so is undefined when there's no slope, which means a vertical angle, 90 degrees or -90 degrees aka 270 degrees.

In radians that's pi/2 and 3pi/2, choice C

answer: 12   they all have at least 28 days

step-by-step explanation: haha

answers

\3. yes the presentation (i.e. odd numbers being written as differences of two squares) is possible for all odd natural number however the presentation may not be unique. for example,  57=112−82=292−28257=112−82=292−282.

\4. 2 can't be written as a difference of two squares because 4-1=3 and 1-1=0 and the difference of squares grows to integers larger that 3.

can i get some in proving questions 1 and 2?