Saturday

January 31, 2015

January 31, 2015

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.

**Answer this Question**

**Related Questions**

Trigonometry - Please review and tell me if i did something wrong. Find the ...

Trigonometry - Hello all, In our math class, we are practicing the trigonometric...

Maths - More than one question please help me - Hi everyone :) I need a lot of ...

Maths - 1) Simplification (trigonometric ratios of allied angles)? Simplify : i...

Trigonometry - Proof - Prove that cot x + tan x = csc x * sec x whenever both ...

Trigonometry - If A + B + C = 180°, Prove that Sinē (A/2) + sinē (B/2) - sinē(C/...

Trig - 4. Asked to simplify the expression sin(180−č), Rory volunteered ...

trig - simplify tan(-17 degree)+sin(24 degree)+cot(73 degrees)+cos(66 degrees ...

Trigonometry - If A + B + C = 180°, Prove that Sinē (A/2) + sinē (B/2) + sinē(C/...

Trigonometry - express in terms of sine and cosine. a) tan theta/ cot theta i ...