- #1

Callumnc1

- 868

- 103

- Homework Statement:
- Please see below

- Relevant Equations:
- Please see below

For this problem,

The solution is,

However, can someone please explain how this is showing equation 15.35 as a solution of equation 15.34? I though both sides should be equal without assuming that ##\phi = 90##

Also why are they allowed to assume ##\phi = 90##?

Many thanks!

The solution is,

However, can someone please explain how this is showing equation 15.35 as a solution of equation 15.34? I though both sides should be equal without assuming that ##\phi = 90##

Also why are they allowed to assume ##\phi = 90##?

Many thanks!