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Grade: 12

                        

If cos^2( A) = cos ^2 (B) can we say angle A = angle B

4 months ago

Answers : (3)

Arun
24737 Points
							
Dear student
 
If cos²A = cos²B
then we can not say A = B
 
As if A + B = nπ
Then
A = nπ- B
 
Then always also cos²A = cos²B
4 months ago
Vikas TU
12127 Points
							
For a slightly different solution,
2cos2A−2sin2B
=2cos2A−1+1−2sin2B
=cos2A+cos2B
=2cos(A+B)cos(A−B)
and halve each side.
4 months ago
Yashraj
318 Points
							
if you are thinking to take square root and just say cosa=cosb
actually you forget to take mode after taking root
so there can be also one case 
a=-b
4 months ago
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