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sk

· started a discussion

· 1 Months ago

shortcut method (Question: 187980.0 )

sir,
please provide shortcut method on this math

Question:
If a cot\(\theta\) + b cosec\(\theta\) = x2 and b cot\(\theta\) + a cosec\(\theta\) = y2 then the value of (a2 – b2) is —
Options:
A) 1
B) x4 - y4 
C) y4 - x4
D) 0
Solution:
Ans: (c)



Gaurav Singh

· commented

· 1 Months ago

nice rohit great shortcut

rohit singh

· commented

· 1 Months ago

Well there is a short cut here...... since sin and cos terms are not appearing either in Q or Ans , Just put --theta=90 .... U will get b=x(2) and a=y(2)..... a(2)-b(2) = y(4)-x(4)

Robert Wary

· commented

· 1 Months ago

No shortcuts, go with the experts
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