trig
posted by Gaile .
write an equation expressing:
cos37cos99 as a sum
Review question. I know the formula. Having trouble with working it out.

cos A cos B = ½(cos(A−B) + cos(A+B))
Respond to this Question
Similar Questions

Math
having trouble solving equation 8+3x641=13 can anyone help we have tried everything and it's not working out for me is that 3x or 3*6 3*6 Are you sure you put the right equation? 
math(trig)
i need to figure out how to write the formula for the following question In a right triangle a = 30 yds and t5an A = 2. Find b and c. I have the answers but do not know how to write the formula. Can you help me ? 
Math 12
Hey everyone; There are some questions on my review I am having trouble with. 4. Evaluate each logarithm. g)log base 5 square root 5 I can't figure out how to do square roots... h)log base 3 1 I got 3, but the anwser is 0 Also, directions … 
Trigonometry
Hi, I need help with this question: Use the addition and subtraction formulas ti fubd the exact values of the trigonometric ratios: cos(7pi/12) Okay, I'm just having trouble with a rather basic part of the question... I wrote cos(pi/4 … 
trig
write equations expressing: 19cos(theta50degrees) as a sum of sine and cosine. 
trig
write an equation expressing 19cos(theta50degrees) as a sum of sine and cosine. 
math
I'm working on some review problems in Math and having trouble on the critical thinking one. The question says is it possible for 2 numbers to have the same LCM and GCF? 
Geometry
I am having trouble with this question. I do not know where to begin. I am in Trig now and we are doing review but I forgot everything that I learned in Geometry. I want to understand how to do this problem. "a picture measures 20 … 
Math
Please help me with my midterm review my teacher was out sick today and idk how much longer she will be but my midterms Thursday. She only helps people who she has seen done there midterm review and gotten over half of it right so … 
Math (Trig Review)
Evaluate the expression without using a calculator (Make a sketch of a right triangle) tan(arccot 2) Thanks in advance! I'm trying to refresh my memory of these kinds of problems and I'm having trouble on how to solve this problem