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# use an addition or subtraction formula to simplify the equation

For cos x cos 3x - sin x sin 3x=0 use an addition or subtraction formula to simplify the equation and then find all solutions of the equation in the interval [0, pi)   the answer...

# Use an addition or subtraction formula to write the expression as a trigonometric function of one number:

cos (3pi/7) cos (2pi/21)+ sin (3pi/7) sin (2pi/21)= cos (pi/A)= B/2 A= B=

what ist 23+332

# Adding fractions by finding the LCD?

I can't seem to get past this problem...   2x   +     5      3x         x-8   For...

# Help with fractions that contain exponents, factoring and LCD?

I have three problems that I can't completely figure.  I appreciate any help and explanations!       17        -    6   x2-12x+35     ...

# what are four consecutive integers whose sum is 86?

This promblem includes integers

# Solve the system with the addition method: {(-20 x -16 y, =, 8),(-5 x -4 y,=, 2)

Solve the system with the addition method: {(-20 x -16 y, =, 8),(-5 x -4 y,=, 2)

# solve 3(39.25)+2(-55.25)=7.25

solve 3(39.25)+2(-55.25)=7.25

# What is the value of (301+302+303+…+325) – (1+2+3+…+25)?

What is the value of (301+302+303+…+325) – (1+2+3+…+25)?