Sunday

December 21, 2014

December 21, 2014

Posted by **Ria** on Monday, May 17, 2010 at 12:33am.

Explain why cos^2theta + cos^2beta + cos^2gama = 1

- Calculus -
**drwls**, Monday, May 17, 2010 at 6:03amThe Pythagorean therem, applied twice, says that the sum of the squares of projections onto three perpendicular axes, of a segment of any vector with length 1, equals the length of the vector (1)

**Answer this Question**

**Related Questions**

Pre Calc. - Use the sum or difference identity to find the exact value of sin255...

math - How would you establish this identity: (1+sec(beta))/(sec(beta))=(sin^2(...

Math - sin theta = 8/17 and theta is in the second quadrant. Find sin(2theta),...

Vector Algebra - Find the direction angles of the vector given below. Then write...

Calculus - I wanted to confirm that I solved these problems correctly (we had to...

math - There are no typos and no work b/c I don't know how to do them. Thanks. 1...

algebra - Can someone please help me do this problem? That would be great! ...

Trigonometry (repost Reiny) - at 1:35am I posted ; Write equivalent equations in...

trig - given that 1/2pi<theta<pi and sin theta=1/5, use appropriate ...

Trigonometry - Checking my work - Find the sum of the three smallest positive ...