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The principal amplitude of (sin40^(@)+...

The principal amplitude of
`(sin40^(@)+icos40^(@))^(5)`, is

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The principal argument of (sin 40^(@) + i cos 40^(@))^(5) is

2 sin 40^(@) sin 10^(@)=

sin 70^@ - cos 40^(@) =

cos70^(@)+sin40^(@)=

cos70^(@)+sin40^(@)=

The value of sin40^@-cos50^@ is

Find the principal value of cot^(-1)(cot40)

Which is greater and why ? sin40^(@) or cos50^(@)