Question

cos^4 theta - sin^4 theta






please solve this ​

Answer 1

Answer:

Step-by-step explanation:

cos4 theta - sin^4 theta

(cos²theta)² - (sin²theta)²

using a² - b² = (a+b)(a-b)

(cos²theta + sin²theta)(cos²theta - sin²theta)

1 ( cos²theta - sin²theta)

cos²theta - sin²theta

1 - sin²theta - sin²theta

1 - 2sin²theta

HOPE IT HELPS YOU :)