Math, asked by singhasjokkumap49bce, 1 year ago

solve the following and also tell why cos(-2x) has changed to cos(2x) int he following---
2sin4xcos(-2x)+2sin4x

Answers

Answered by Anonymous
1
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
Anonymous: yaa of course buddy
singhasjokkumap49bce: thankss bhai
Anonymous: yaa...
Anonymous: actually sine (-theta) = -sine theta......but cos (-theta ) = cos theta
singhasjokkumap49bce: kk
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