Answers

2016-02-17T17:53:19+05:30
Sin(a+b)= sinacosb+sinbcosa
=sin90cos30+sin30cos90
=1xroot3/2 + 1/2 x 0
=root3/2
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2016-02-17T17:56:03+05:30
We know that sin(90°+x°) = cosx°
⇒ sin(90° + 30°) = cos30°
= √3/2
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