Evaluate: `i^80`

Evaluate: cos80^@cos20^@+sin80^@sin20^@

Evaluate (Tan 80)/(Cot 10)

Evaluate: tan 10 / cot 80

Evaluate : (i) 3 cos 80^(@) "cosec 10"^(@) + 2 sin 59^(@) sec 31^(@) (ii) (cos 70^(@))/(sin 20^(@)) + (cos 59^(@))/(sin 31^(@)) - 8 sin^(2) 30^(@) (iii) "cosec" (65^(@) + A) - sec(25^(@) - A)

Evaluate sqrt80 correct to three significant digits.

Evaluate: (96 sin 65^(@) sin35^(@) sin80^(@))/(sin20^(@) + 2 sin 80^(@) cos30^@)

Evaluate |(sin 10^(@) -cos 10^(@)),(sin 80^(@) cos 80^(@))|

Evaluate: (sqrt 80)/(sqrt(405))

Find the value of sin80cos20cos80sin20