Question

What is the value of [( cos 67 degree) ^ 2 - (sin 23 degree) ^ 2]

Answer 1

Answer:

0

Step-by-step explanation:

[( cos 67 degree) ^ 2 - (sin 23 degree) ^ 2]

cos²67degree - sin²(90-67)degree

cos²67 degree - cos²67 degree

⇒0