solve the following 9 exercises:
if senz = e ^ iz - e ^ -iz / 2i , cosz = e ^ iz - e ^ -iz / 2
1. sen^2 z + cos^2 z=1
2. 1+tan^2 z = sec^2 z
3. 1+cot^2 z = csc^2 z
4. sen(-z)=-sen z
5. cos (-z)=cos z
6. tan (-z)=-tan z
7. sen (z1+z2)=sen z1 cos z1 +sen z2 cos z2
8. cos (z1+z2)=cos z1 cos z2 - sen z1 sen z2
9. tan (z1+z2)= tan z1 + tan z2 / 1-tan z1 tan z2

the answer would be 1 1/72

step-by-step explanation:

you can rewrite the equation by separating the parts and then solving individually:

10-9=1

1/8 - 1/9=

find l c d and then combine:

1 1/72

exa:

)

3+11

14

step-by-step explanation:

from this example, we can see that subtracting with integers is the same as adding the opposite. we can solve using a number line or by using the saying "keep, change, change" to us solve. it is important to remember that we can subtract a negative and end up with a larger number than we started with.

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.