Solve for a k=420*cos(a+b)-455*cos(a)

Math
Rewrite the equation as .
Multiply by .
Add to both sides of the equation.
Divide each term by and simplify.
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Divide each term in by .
Cancel the common factor of .
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Cancel the common factor.
Divide by .
Cancel the common factor of and .
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Factor out of .
Cancel the common factors.
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Factor out of .
Cancel the common factor.
Rewrite the expression.
Move all terms containing to the left side of the equation.
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Subtract from both sides of the equation.
Simplify the left side of the equation.
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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 .
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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 .
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Factor out of .
Cancel the common factor.
Rewrite the expression.
Add to both sides of the equation.
Divide each term by and simplify.
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Divide each term in by .
Cancel the common factor of .
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Cancel the common factor.
Divide by .
Multiply .
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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.
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Simplify the left side.
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Cancel the common factor of .
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Cancel the common factor.
Rewrite the expression.
Cancel the common factor of .
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Factor out of .
Cancel the common factor.
Rewrite the expression.
Simplify .
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Apply the distributive property.
Combine and .
Cancel the common factor of .
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Move the leading negative in into the numerator.
Factor out of .
Cancel the common factor.
Rewrite the expression.
Multiply and .
Simplify the expression.
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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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