Question

13. If cos 30º = 2 cos-15° - 1, then cos 15º =? ​

Answer 1

$\huge\underline\mathfrak\red{Varun}$♥

❤.√3/2=2cos15-1

√3+2/2=2cos15

√3+2/4=cos15

Answer 2

$\huge{\fbox{\fbox{\bigstar{\mathfrak{\pink{SINGLE♡}}}}}}$

♡

cos 30° = 2 cos - 15° - 1

[ cos 30 = √3/2 ]

√3/2 = 2 cos - 15 - 1

√3/2 / 2 = 2 cos - 15 - 1

√3+2 / 2.2 = cos 15

√3+2 / 4 = cos 15°