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

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Using the cofunction identity, sin(90° - θ) = cos(θ), we can rewrite the expression as sin²20° + sin²27° + cos²20° + cos²27°. Since sin²θ + cos²θ = 1 for any angle θ, the expression simplifies to 1 + 1 = 2.

Use the Cofunction Identities to Evaluate the Expression Below Without 12\frac { 1 } { 2 }21​

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