Question

dear plse solve 30 ii​

Answer 1

Answer:

Step-by-step explanation:

As sin + 2cos = 1

By squaring on BS

sin² + 4cos² + 4 X sin X Cos =1

(1-cos²) + 4 X (1- sin²) + 4 X sin X cos = 1

1 - cos² + 4 - 4 X sin² + 4 X sin X  cos = 1

By multiplying both sides by -1, we get

cos² - 4 + 4 X sin² - 4 X sin X cos = 0

cos² + 4 X sin² - 4 X sin X cos = 4

(2 * sin - cos )² = (2)²

Square root both the side

SO  2sin - cos = 2

Answer 2

Hope it is helpful☺☺