Write the sum as a product: $$ \cos ( 21.7 c) + \cos ( 4.1 c) = { } \square $$ Note: coefficients inside of the trigonometric functions should be entered as (simplified) decimal values do not enter fractions inside of the trig functions...else they will be marked incorrect by the system. For example, if your answer is $$ \frac { 11} { 2} $$ , enter 5.5 instead of $$ 11 / 2 $$ .

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Write the sum as a product: $$ \cos ( 21.7 c) + \cos ( 4.1 c) = { } \square $$ Note: coefficients inside of the trigonometric functions should be entered as (simplified) decimal values do not enter fractions inside of the trig functions...else they will be marked incorrect by the system. For example, if your answer is $$ \frac { 11} { 2} $$ , enter 5.5 instead of $$ 11 / 2 $$ .

Perkins Klein · Accepted Answer

The sum $$ \cos ( 21.7 c ) + \cos ( 4.1 c ) $$ as a product is: $$2 \cos ( 12.9 c ) \cos ( 8.8 c ) $$

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