I am very confused about the concepts of..

sin è = sin(180 - è)
sin (180 + è)= -sinè
tan (180 - è) = -tanè

and how the final answer was found in this problem...

Find cos 510:

cos510=cos(540-30)
=-cos30
=-s.r3/2

i don't understand how we went from -cos 30 to -s.r3/2 ?

Ask a New Question or answer this question.

Similar Questions

What is concepts of reliability and validity as they pertain to psychological testing?I have a test comming up and I am confused
1. 2 answers
I need help with week 9 capstone discussion question.What are the five most valuable classroom management concepts that build a
1. 1 answer
What is a level of the conceptual framework for financial reporting?Recognition and measurement concepts Final concepts
1. 1 answer
1. She was confused at his error.1-2. She was confused by his error. 2. He was confused about something. 3. He is confused in
1. 1 answer