Question

If cos 28°+sin 28° =k3 then cos 17° is equal to​

Answer 1

find two irrational numbers between 0.13 and 0.145

Answer 2

Answer:

Given:

cos28°+sin28°=k^3

OR,

cos28°+cos62°=k^3[since,sin 28°=cos62°]

OR,

2.cos45°.cos17°=k^3[using formula of compound angles]

OR,

√2.cos17°=k^3

OR,

cos17°=k^3/√2.