Ineed to find sec(theta)= 2(sqrt3)/3

30° and 330°

Step-by-step explanation:

sec θ =

sec θ =

=

cos θ =

cos θ =

cos θ =

cos θ =

Look at the Unit Circle to see that cos = at 30° and 330°  ( which is equivalent to π/6 and 11π/6)

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?