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Prove (sin 5x + sin 3x)/(cos 5x + cos 3x) = tan 4x
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In this video, we will learn to prove the equation (sin 5x + sin 3x)/(cos 5x + cos 3x) = tan 4x.
The link of the video explaining, the proof of the identity sin A + sin B = 2 sin((A+B)/2) cos((A-B)/2) has been given below
The link of the video explaining, the proof of the identity cos A + cos B = 2 cos((A+B)/2) cos((A-B)/2) has been given below
Other topics of this video are:
Class XI exercise 3.3 problem 17
NCERT Class XI exercise 3.3 problem 17
I, Ravi Ranjan Kumar Singh, have produced this video. All credits of this video belong to me.
The link of the video explaining, the proof of the identity sin A + sin B = 2 sin((A+B)/2) cos((A-B)/2) has been given below
The link of the video explaining, the proof of the identity cos A + cos B = 2 cos((A+B)/2) cos((A-B)/2) has been given below
Other topics of this video are:
Class XI exercise 3.3 problem 17
NCERT Class XI exercise 3.3 problem 17
I, Ravi Ranjan Kumar Singh, have produced this video. All credits of this video belong to me.
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