Question

Express sin (-65) degree in terms of the ratio of a positive angle which is less than 45 degrees​

Answer 1

Answer:

Sin(-65) cannot be expressed as a ratio of positive angles as sin (-65) is minus sin(65) i.e. -sin(65) which is negative.  

Thus, Sin Cos Tan are all positive in the range of +ve angles less than 45 degrees. Therefore the ratio of two +ve quantities cannot be used to express a negative -ve quantity.