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Greta

· started a discussion

· 1 Months ago

solution (Question: 252291.0 )

let k=x sin theta=y cos theta= z tan 2theta
for k=1 and theta=30 degree, we get
x = 2,y=2/root3 and z=1/root3. substitute these in the eq, we get 64/9.
option c also gives answer as 64/9

Question:
If x sin \(\theta\) = y cos \(\theta\) =  \(\cfrac{2z\ tan\ \theta}{1-tan^2\ \theta}\) , then what is 4z2(x2 + y2) equal to?
Options:
A) (x2 + y2)3
B) (x2 – y2)3
C) (x2 – y2)2
D) (x2 + y2)2
Solution:

Ans: (c) 

ANKIT

· commented

· 1 Months ago

good

mayank davaggar

· commented

· 1 Months ago

nhi aa rha bhai isse

Sagar Sharma

· commented

· 1 Months ago

nice trick
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