Question

Marks: 1/40
If cosec 15 = √2 (√3+1), what is the value
of Cos 75?​

Answer 1

cos 75

cos ( 45 + 30)

cos45 * cos30 - sin45 * sin30

√3 /  (2√2)  -  1 / ( 2√2)

(√3 - 1 ) / ( 2 √2 )

(√6 - √2) / 4