1. (i)
all the other problems can be solved similarly using various trigonometric identities. So you better familiarize yourself with them. Here's a good place to start:
List of trigonometric identities - Wikipedia, the free encyclopedia
1. (i)
all the other problems can be solved similarly using various trigonometric identities. So you better familiarize yourself with them. Here's a good place to start:
List of trigonometric identities - Wikipedia, the free encyclopedia