# Solve for a k=420*cos(a+b)-455*cos(a) Rewrite the equation as .
Multiply by .
Add to both sides of the equation.
Divide each term by and simplify.
Divide each term in by .
Cancel the common factor of .
Cancel the common factor.
Divide by .
Cancel the common factor of and .
Factor out of .
Cancel the common factors.
Factor out of .
Cancel the common factor.
Rewrite the expression.
Move all terms containing to the left side of the equation.
Subtract from both sides of the equation.
Simplify the left side of the equation.
To write as a fraction with a common denominator, multiply by .
Write each expression with a common denominator of , by multiplying each by an appropriate factor of .
Combine.
Multiply by .
Combine the numerators over the common denominator.
Move to the left of .
Multiply both sides of the equation by .
Remove parentheses.
Cancel the common factor of .
Factor out of .
Cancel the common factor.
Rewrite the expression.
Add to both sides of the equation.
Divide each term by and simplify.
Divide each term in by .
Cancel the common factor of .
Cancel the common factor.
Divide by .
Multiply .
Multiply and .
Multiply by .
Rewrite the equation as .
Subtract from both sides of the equation.
Multiply both sides of the equation by .
Simplify both sides of the equation.
Simplify the left side.
Cancel the common factor of .
Cancel the common factor.
Rewrite the expression.
Cancel the common factor of .
Factor out of .
Cancel the common factor.
Rewrite the expression.
Simplify .
Apply the distributive property.
Combine and .
Cancel the common factor of .
Move the leading negative in into the numerator.
Factor out of .
Cancel the common factor.
Rewrite the expression.
Multiply and .
Simplify the expression.
Multiply by .
Move the negative in front of the fraction.
Solve for a k=420*cos(a+b)-455*cos(a)

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