Sunday
April 20, 2014

Homework Help: Trig

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

What is the exact value of cos 40 degrees cos 50 degrees minus sin 40 degrees sin 50 degrees

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

First Name:
School Subject:
Answer:

Related Questions

trig - Reduce the following to the sine or cosine of one angle: (i) sin145*cos75...
Math - 1. Find the value of Sin^-1(-1/2) a. -30 degrees b. 30 degrees c. 150 ...
trig math 30 - Find the exact value of cos 8 degrees cos 38 degrees + sin 8 ...
math - 1)In triangle ABC, C=60 degrees, a=12, and b=5. Find c. A)109.0 B)10.4 C)...
Algebra II - Multiple Choice (theta) means the symbol 0 with the dash in it. 1.)...
Trig hep, please? Thank you! - 1. Find the exact value of sin(195(degrees)) 2. ...
precalc/Trig - Assume we know the following: cos(22.5 degrees)= sqrt(2+sqrt2)/2 ...
Trig(3 all with work) - 1)Find the exact value of cos 105 by using a half-angle ...
trig - Evaluate sin(29 degrees)cos(31 degrees) + cos(29 degrees)sin(31 degrees) ...
math - find the exact value of [sec(-30 degrees)- cot 120 degrees]/1-cosec^2(45 ...

Search
Members