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shefali sharma Grade: 12
        

find value of sin{1/4(sin inverse(63^1/2)/8))} is ___________


 


ans: 1/2.2^1/2

6 years ago

Answers : (1)

Vinay Arya
37 Points
										

Hi Shefall Sharma


631/2 is nearly equal to 8.


sin{[sin-1(631/2/8)]/4}=sin(90o/4)=sin(45o/2)               


We know that cos2A = 1-2sin2A


    Putting A=45o/2


   cos45o=1-2sin2(45o/2)=>sin(45o/2)= [(21/2-1)/21/2]1/2


 Therefore, sin{[sin-1(631/2/8)]/4}=[(21/2-1)/21/2]1/2

6 years ago
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