Grade 11Algebra
The value of sin 22/7÷10 + sin 13×22/7÷10 is.......(a)1/2(b)root3/2(c)1(d)-1/2
1 Answer
Arun
Sin π /10 + sin 13 π /10
= - sin π /10 + sin π + 3 π/ 10
= - sin π /10 - sin 3 π /10
= - sin π /10 - sin π/ 2 - 2 π/ 10 =
= - sin π /10 - sin 2 π
= -1/2
= - sin π /10 + sin π + 3 π/ 10
= - sin π /10 - sin 3 π /10
= - sin π /10 - sin π/ 2 - 2 π/ 10 =
= - sin π /10 - sin 2 π
= -1/2
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