Tuesday

July 29, 2014

July 29, 2014

Posted by **sophie** on Monday, June 1, 2009 at 8:26pm.

a. (-√2 - √6)/4

b. (√6 - √2)/4

c. (√6 + √2)/4

d. (√2 - √6)/4

is it A?

- Math -
**bobpursley**, Monday, June 1, 2009 at 8:47pma) is the sine of 285

b) is the sine of 15, 165

c) is the sine of 75, 105

d) is the sine of -15, 195

check my thinking.

- Math -
**sophie**, Monday, June 1, 2009 at 8:53pmit's B?

- Math -
**Reiny**, Monday, June 1, 2009 at 8:54pmnone of the given answers is correct.

Are you sure you typed it correctly?

sin 225 = sin(180+45)

= sin180cos45 + cos180sin45

= 0 + (-1)√2/2

= -√2/2

- Math -
**sophie**, Monday, June 1, 2009 at 9:11pmno those are the options for sure :/

- Math -
**MathMate**, Monday, June 1, 2009 at 11:22pmAre you sure it is not

> Use a sum or difference identity to find the exact value of sin2**5**5

**Related Questions**

Math - Find an equation of the line that bisects the obtuse angles formed by the...

Algebra - How would i complete these problems? 1. (√6mn)^5 2. ^3√16x...

maths - I will be thankfull to you if you help me to solve the below problem: 6...

Math help Ms. Sue please - 1. What is the simplified form of the expression? 7m^...

Algebra Work Check - 1. 5√6 * 1/6√216 5/6 * √1296 5/6 * √...

Math - Determine the exact value of cos 465 degrees a) √3 + √2/2 b...

Precalculus - Determine the exact value of cos 465 degrees a) √3 + √...

algebra 1 - alright i have a few questions if its ok..? Simplify: 1. -2√(...

Algebra - Simplify the expressions and solve the equations 1. 2√3 - √...

grade 11 math - I don't get how to do this. I'm so lost please help me. ...