if cos 9 (a + b ) = 0 , then find the value of sin (a + b ) .
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cos 9(a+b)=0
⇒cos 9(a+b)=cos 90°
⇒9(a+b)=90°
⇒a+b=10
sin(a+b)=sin 10°
⇒cos 9(a+b)=cos 90°
⇒9(a+b)=90°
⇒a+b=10
sin(a+b)=sin 10°
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