Use the Cofunction Identities to Evaluate the Expression Below Without $\cos ^ { 2 } 20 ^ { \circ } + \cos ^ { 2 } 57 ^ { \circ } + \cos ^ { 2 } 70 ^ { \circ } + \cos ^ { 2 } 33 ^ { \circ }$

question 215

Multiple Choice

Use the cofunction identities to evaluate the expression below without the aid of a calculator. $\cos ^ { 2 } 20 ^ { \circ } + \cos ^ { 2 } 57 ^ { \circ } + \cos ^ { 2 } 70 ^ { \circ } + \cos ^ { 2 } 33 ^ { \circ }$

• A)1
• B)2
• C)-1
• D)0
• E) \(\frac { 1 } { 2 }\)

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