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Algebraically it is written as

Cos(56)

However, on the calculator, make sure your calculator is 'clear' and in 'degree' mode.

Cos(56) = 0.559182903....

Cos(56) = 0.5592 ( 4 d.p.)

or

Cos(56) = 0.559183 (6 d.p.).

NB If your calculator is in 'inverse', 'radian' or 'grad(g)' modes you will have an incorrect answer.

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lenpollock

Lvl 17
1d ago

What else can I help you with?