resonance open test...

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no of solutions of the equation:

sin²x + sin²2x - sin²3x - sin²4x=0
lying in the inteval (0, pi/2].
a)4
b)2
c)3
d)5

(one answer correct.. three marks question...)... so hope there has to be some trick to solve this one... plz ny of you ans...

#Mathematics #Trignometry

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Lokesh Verma ·2008-11-19 20:17:45

This expression gets reduced to -2sin2x. cosx. sin5x.
this does not take too much time! probably
now just check the zeroes of this expression in the given interval..

i got 2.. but just check once..

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Basic Integral Calculus Operators Symbols Matrix Cases

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∫ ∫ ∫ ∫ ∫ ∬ ∬ ∬ ∬ ∬ ∭ ∭ ∭ ∭ ∭ ⨌ ⨌ ⨌ ⨌ ⨌

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resonance open test...

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