calculator
I just recently start to learn cos. I found out when I use different calculators to calculate cos, sometimes may get different results which is quite confusing.
For example, cos(35), I am calculating degrees.
on 1 calculator:
on another calcuator:
Could anyone explain me why this happens and which one is correct?
It is very confusing for me.
Thanks for any responds.
It depends on how we 'read' $21.99 + 9.75\%$
(1) As $\%$ is derived from the latin 'per centum' (which means 'out of one hundred'), we have $$ 9.75\% = \frac{9.75}{100} = 0.00975 $$ giving answer one.
(2) Many calculators allow the input 21.99 + 9.75% being a shortcut for the operation 'add 9.75% of 21.99 to the given 21.99', which is
$$ 9.75\% \cdot 21.99 = 2.144025 $$
giving the second answer.
If I should choose the 'correct' one, this would be (1), but the better way is not to use notation like that.
Answer:One direct formula may not be possible but I have derived a formula from cashflows and you can see below.
If you need the EXCEL worksheet to culculate, let me know your email address, I shall send it to you.
Thanks Satish
Best Answer
On the first calculator the calculator is calibrated to take input in degrees whereas in second it is in radians .