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Grade 10Trigonometry

X sin cube theta +y cos cube theta =sin theta cos theta and x sin theta - y cos theta=0 . Then xsquare + y square

Question image for X sin cube theta +y cos cube theta =sin theta cos
Profile image of Utkal
8 Years agoGrade 10
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1 Answer

Profile image of Arun
8 Years ago
xsin3? + ycos3? = sin?cos? 
 
and xsin?=ycos? 
 
Put this value in above equation we get
 
xsin3? + xsin?cos2? = sin?cos? 
xsin?(sin2? + cos2?) = sin?cos? 
x=cos?
so y=sin?
 
hence x2 + y2 = sin2? + cos2? = 1
 
Option B is correct

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