Question

If cos2θ -sin2θ=1/3, value of (cos4θ-sin4θ+1) is:

(A) 4/3

(B) 5/3

Read 12 Solution.

option A     

ASHOK M BHARTI 11 year ago is this solution helpfull: 1 1

given that

cos2 θ-sin2 θ=1/3

cos2 θ=1/3-sin2 θ

sqaring boththe side

cos4 θ= 1/9+sin4 θ-2/3sin2 θ

VIPUL PANDEY 11 year ago is this solution helpfull: 1 1

 

cos2θ -sin2θ=1/3..........<i>

=

 

cos4θ-sin4θ+1

can be written as

<cos2θ -sin2θ><cos2θ+sin2θ>+1

=<1/3> <1> +1...........<from i.

=4/3

RATTAN SINGH 11 year ago is this solution helpfull: 3 0

7/3

MANISHAGAJWANI 11 year ago is this solution helpfull: 0 1
NISCHAL ACHARYA 11 year ago is this solution helpfull: 0 1
NISCHAL ACHARYA 11 year ago is this solution helpfull: 0 1
NISCHAL ACHARYA 11 year ago is this solution helpfull: 0 1
NISCHAL ACHARYA 11 year ago is this solution helpfull: 0 1
AARSHI 10 year ago is this solution helpfull: 1 0
Option A) 4/3
AARSHI 10 year ago is this solution helpfull: 1 0
Option A) 4/3
AARSHI 10 year ago is this solution helpfull: 1 0
Option A) 4/3
AARSHI 10 year ago is this solution helpfull: 1 0

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