1.

If cosalpha=(1)/(sqrt5)(0°ltalphalt90^(@))andcosbeta=(1)/(sqrt10),(270^(@)ltbetalt360^(@)) then the value of sin(alpha+beta) is

Answer»

`(1)/(SQRT2)`
`(1)/(5sqrt2)`
`-(3)/(5sqrt2)`
`-(1)/(5sqrt2)`

ANSWER :A::B


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