sin(-750^(@))=?

The value of "cosec"(-750^(@)) is

Prove that sin750^(@)cos480^(@)+cos120^(@)cos60^(@)=(-1)/2

Find the values of (i) " sin "405^(@) " " (ii) " sec " (-1470^(@)) " "(iii) " tan " (-300^(@)) (iv) " cot " (585^(@)) " "(v) " cosec " (-750^(@)) " "(vi) " cos " (-2220^(@))

On heating at 750^(@)C , blue virtiol yields

Find the value of cosec 750^(@)

Convert 750^(@) into radians ?

tan750^@ = ……….

On heating a litre of N/2HCI solution, 2-750 g of HCI is lost and the volume of solution becomes 750 ml. The normality of resulting solution will be.