Tuesday

October 21, 2014

October 21, 2014

Posted by **Michael** on Wednesday, March 28, 2007 at 1:58pm.

do you know the formula

cos(A+b) = cosAcosB - sinAsinB

now compare it with your

cos 40 degrees cos 50 degrees minus sin 40 degrees sin 50 degrees

**Answer this Question**

**Related Questions**

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

trig - Reduce the following to the sine or cosine of one angle: (i) sin145*cos75...

Algebra II - Multiple Choice (theta) means the symbol 0 with the dash in it. 1.)...

Trig(3 all with work) - 1)Find the exact value of cos 105 by using a half-angle ...

trig math 30 - Find the exact value of cos 8 degrees cos 38 degrees + sin 8 ...

trigonometry (please double check this) - Solve the following trig equations. ...

TRIG! - Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...

Math - 1. Find the value of Sin^-1(-1/2) a. -30 degrees b. 30 degrees c. 150 ...

Trig hep, please? Thank you! - 1. Find the exact value of sin(195(degrees)) 2. ...

trig - Evaluate sin(29 degrees)cos(31 degrees) + cos(29 degrees)sin(31 degrees) ...