solve the following and also tell why cos(-2x) has changed to cos(2x) int he following---
2sin4xcos(-2x)+2sin4x
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Cos (- theta) is always cos (theta) because the graph of cos is always forms a mirror sysmettry such that ...the positive and negative graph of cosine in the Cartesian plane always correspond each other symmetrically....
singhasjokkumap49bce:
so directly in next line i can write it 2x instead of -2x
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