1.

If `sinalpha=1/2` and `cosbeta=1/2`, then the value of `(alpha+beta)` isA. `0^(@)`B. `30^(@)`C. `60^(@)`D. `90^(@)`

Answer» Correct Answer - D
Given, `sinalpha=1/2=sin30^(@)` `[therefore sin 30^(@)=1/2]`
`rArr alpha=30^(@)`
and `cosbeta=1/2=cos60^(2)` `[therefore cos60^(@)=1/2]`
`rArr beta=60^(@)`
`therefore alpha+beta=30^(@)+60^(@)=90^(@)`


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