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Use the Cofunction Identities to Evaluate the Expression Below Without cos⁡220∘+cos⁡257∘+cos⁡270∘+cos⁡233∘\cos ^ { 2 } 20 ^ { \circ } + \cos ^ { 2 } 57 ^ { \circ } + \cos ^ { 2 } 70 ^ { \circ } + \cos ^ { 2 } 33 ^ { \circ }

Question 43

Multiple Choice

Use the cofunction identities to evaluate the expression below without the aid of a calculator. cos⁡220∘+cos⁡257∘+cos⁡270∘+cos⁡233∘\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) 12\frac { 1 } { 2 }

Correct Answer:

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