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Prove ((sin 7x + sin 5x) + (sin 9x + sin 3x))/ ((cos 7x + cos 5x) + (cos 9x + cos 3x)) = tan 6x
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In this video, we will learn to prove the equation ((sin 7x + sin 5x) + (sin 9x + sin 3x))/ ((cos 7x + cos 5x) + (cos 9x + cos 3x)) = tan 6x.
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 miscellaneous exercise problem 6
NCERT Class XI miscellaneous exercise problem 6
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 miscellaneous exercise problem 6
NCERT Class XI miscellaneous exercise problem 6
I, Ravi Ranjan Kumar Singh, have produced this video. All credits of this video belong to me.
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