1. This can be written in explicitly trigonometric and hyperbolic form using the properties of the complex functions .
2. Using the properties of the trigonometric and hyperbolic functions , this may be written in explicitly complex form :

no

1. He decided to teach Indian history '' because he wanted to study it '' .
2. He decided to study Indian history because he wanted to teach it .

no

1. An important advantage ( projected by Carr ) was that '' if Soviet Russia had eventually to fight Hitler , the Western Powers would already be involved . ''
2. One important advantage ( projected by Carr ) was that '' if Soviet Russia had to fight Hitler eventually , the Western forces would already be involved .
yes