jandrew8007
14.09.2019 •
Mathematics
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
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Ответ:
A = 0.785m²
B = 31400cm²
C = 7850cm²
D = 785,000mm²
Use the fomula to find the area.
If you are having trouble finding the radius divide the diamater by two.
For refrence use 3.14 as pi when multiplying:)