Question

Riddle Time!! Answer only if you know with explanation <br /><br /><br />Professor Devonshire was losing his marbles, Dr. Wallaby thought, staring at the equations filling the board in Dr. Devonshire’s office. What kind of addition was this?<br /><br />1+1 = 6<br /><br />2+1 = 6<br /><br />1+6 = 6<br /><br />2+6 = 6<br /><br />6+6 = 6<br /><br />1+3 = 8<br /><br />7+9 = ?<br /><br />I wonder what goes in the blank?<br /><br />​

Answer 1

Answer:

Trigonometry Ratios Table

Angles (In Degrees) 0° 30° 45° 60° 90° 180° 270° 360°

Angles (In Radians) 0° π/6 π/4 π/3 π/2 π 3π/2 2π

sin 0 1/2 1/√2 √3/2 1 0 -1 0

cos 1 √3/2 1/√2 1/2 0 -1 0 1

tan 0 1/√3 1 √3 ∞ 0 ∞ 0

cot ∞ √3 1 1/√3 0 ∞ 0 ∞

cosec ∞ 2 √2 2/√3 1 ∞ -1 ∞

sec 1 2/√3 √2 2 ∞ -1 ∞ 1