Question

What is the value of sec15

Answer 1

Answer:

-1.3166 is the answer

Answer 2

Answer:

2√2/(√3+1)

Step-by-step explanation:

we have to find,,

sec15 = 1/cos15

so, cos15 = cos(45-30)

as, cos(x-y) = cosxcosy+sinxsiny

so, cos(45-30) =cos45cos30+sin45sin30

= 1/√2×√3/2+1/√2×1/2

= (√3+1)/2√2

so, sec15 = 1/[(√3+1)/2√2]

= 2√2/(√3+1) .... ans.