Question

2 sin² theta - cos² theta =2 find theta​

Answer 1

Step-by-step explanation:

2(sin²-cos²)=2

2(1-cos²-cos2)=2

2-2cos²-cos²=2

-3cos²=0

thetha =pi

Answer 2

=> 2sin² a - cos² a = 2

=> 2sin² a - cos² a = 2 x 1

=> 2sin²a - cos²a = 2 (sin²a+cos²a)

=> 2sin² a - cos² a = 2sin²a + 2cos²a

=> 3 cos²a = 0

=> cos²a = 0

=> cos a = 0

=> cos a = cos 90°

=> a = 90°