Use the Cofunction Identities to Evaluate the Expression Below Without $\frac { 1 } { 2 }$

Multiple Choice

Use the cofunction identities to evaluate the expression below without using calculator. sin²20° + sin²27° + sin²70° + sin²63°

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