Question

cos²67-sin²23 FIND THE VALUE

Answer 1

cos^2 67° - sin^2 23°
= cos^2 (90-23) - sin^2 23°
= sin^2 23° - sin^23°
= 0 ans....

Answer 2

$cos^{2} 67 - sin^{2}23$

= $cos^{2}67 - sin^{2} (90-67)$

= $cos^{2} 67 - cos^{2} 67$

= 0 


i hope this will help you

-by ABHAY