Answer:

Step-by-step explanation:

We know that tanθ = sinθ/cosθ
For a number to be undefined, the denominator must equal to 0. At π/2, the cosθ value is 0 and sinθ is 1. Hence, tan(π/2) is undefined.
Hope I helped :)
First we need to find a common denominator

=

now we can add them

+

=
Answer:
7. 76.7
8. 12.6
Step-by-step explanation:
Let me know in the comments if you want me to explain :)