1.

The value of `sin50^(@)-sin70^(@)+sin10^(@)` isA. 1B. 0C. `(1)/(2)`D. 2

Answer» Correct Answer - B
Given expression, `sin50^(@)-sin70^(@)+sin10^(@)`
`" "=2cos((50^(@)+70^(@))/(2))*sin((50^(@)-70^(@))/(2))+sin10^(@)`
`" "=-2cos60^(@)sin10^(@)+sin10^(@)`
`" "=-2*(1)/(2)sin10^(@)+sin10^(@)=0`


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