Question

Evaluate: cos^2 23 - sin^2 67

Answer 1

Answer:

0

Step-by-step explanation:

cos^2 23-sin^2 67

sin^2(90-23)-sin^2 67.........(sin^2 (90-23) =cos^2 23)

sin^2 67-sin^2 67

0

Answer 2

Answer:

$\huge\red{Answer}$

${cos}^{2} 23° - {sin}^{2} 67° \\ \\ {cos}^{2} ( 90° - 67°) - {sin}^{2} 67° \\ \\ {sin}^{2} 67° - {sin}^{2} 67° \\ \\= 0$