Wednesday

July 23, 2014

July 23, 2014

Posted by **Sam** on Tuesday, November 12, 2013 at 6:54pm.

Hint: Express everything in terms of sin and cos. Can you rearrange the result into a form that allows you to use some of the identities you've learned?

How to start? I know I have to use trigonometric identities but where?

Thanks a lot.

- Trigonometry - Proofs -
**Steve**, Tuesday, November 12, 2013 at 8:10pmsin0+180sin180 = 0sin0 + 180sin0

2sin2 + 178sin178 = 2sin2 + 178sin2 = 180sin2

...

88sin88 + 102sin102 = 180sin88

so, we have

180(sin0 + sin2 + sin4 + ... + sin88) + 90sin90

= 180(sin0+sin2+...+sin90) - 90

That makes the average

2(sin0+sin2+...+sin90)-1

Gotta think some more. Back later. See what you can figure out.

**Related Questions**

Math- Geometry Proofs - What are some ways to prove that a triange is isoscles? ...

maths proofs - Take the numbers 4 and 7. If we square them we get 16 and 49, ...

Geometry Proofs, HELP!! - I need help, I have a Geometry Exam on Monday. And I ...

math - Prove that at least one of the real numbers A1, A2, …, A(n) is greater ...

discrete math - If p is prime prove that p^1/2 (root p) is irrational. ...

geometry - ughh i need help i dnt like proofs we'll here it the instructions ...

Proofs and numbers - Prove the following theorem: Suppose p is a prime number, r...

Math - The average of the first 4 numbers is 14. The average of the next 6 ...

Math - The average of 7 numbers is 30. the average of the first to the fourth ...

math - If the average of 11 numbers are 20 and the average of 3 numbers are 48, ...