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I am afraid there is a misunderstanding. The sequence you describe changes the decimal marker from a dot to a comma. It does not insert a thousands separator.
Reset your calculator. If you choose an Exponential display format (Scientific, Engineering, Normal1, Normal2) select more decimal digits. Your current setting seems to display no decimal digits.
If you refer to the exponential function (power to base e = 2,7182818...), the key sequence is [SHIFT] [ln]. (rightmost button column, two rows below the ON key).
If you refer to a key allowing to enter powers of 10, like in 3,14 x 10²³, see the button labeled its located in the bottom button row, center column.
I am having problems with this one. Is this tan(a) + cotan(a)=1? The only solution I get is sec*csc. Tan is sin/cos and cotan is cos/sin which yields sec*csc. Is it supposed to be adding these two or multiplying these two? cuz if it is tan(a) * cotan(a) then the answer is one.
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