Trigonometry
5 videos • 53 views • by Infinity knowledge
1
Why sin(-x) =-sinx
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2
Why cos(-x) =cosx
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3
Signs of trigonometric functions with proof
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4
Why sin(x+y) =sinx.cosy+cosx.siny
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5
Why 2sinx.siny=cos(x-y)-cos(x+y)
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