Full-featured scientific calculator with trigonometric, logarithmic, exponential, and memory functions.
A scientific calculator covers the functions found on a typical exam calculator: sine, cosine, tangent and their inverses, common (base-10) and natural (base-e) logarithms, exponentials, powers, roots, the constants pi and e, and a memory register for holding an intermediate result. You enter the expression with buttons or the keyboard and read the result. The thing users most often get wrong is the angle mode: the same input sin(30) returns 0.5 in degree mode but roughly -0.988 in radian mode. Check the mode indicator before trusting any trig answer.
A concrete input and expected output from the current implementation.
Input
sin(30) with degree mode selected
Expected output
0.5 (degree mode). The same entry in radian mode gives -0.9880316.
Trigonometric functions interpret their argument in the currently selected angle unit. Thirty degrees has sine exactly 1/2, while 30 radians is about 1718.9 degrees, which lands in the fourth quadrant where sine is negative, about -0.9880.
A degree/radian (and sometimes gradian) selector changes how sin, cos, tan, and their inverses interpret their arguments. In degree mode, sin(30) is 0.5 and arcsin(0.5) is 30. In radian mode, arcsin(0.5) returns pi/6, about 0.5236, and sin(30) becomes about -0.9880. The mode applies to every trig entry until you change it.
The log key is base 10 and ln is base e; they are not interchangeable. For other bases, use the change-of-base identity log_b(x) = log(x)/log(b): log_2(8) = log(8)/log(2) = 3. The memory register holds one value: M+ adds the current result to it, M- subtracts from it, recall reads it back, and clear resets it. That is how you keep a running total across several expressions.
The calculator is in radian mode, so it read 30 as 30 radians, about 1718.9 degrees, which sits in the fourth quadrant where sine is negative. Switch the angle mode to degrees and re-enter the expression. This is the most common cause of wrong trig answers, and it is the first thing to check.
Use the change-of-base identity log_b(x) = log(x)/log(b) with the keys that exist. log_2(8) = log(8)/log(2) = 3, and log_5(125) = log(125)/log(5) = 3. Both logarithms may use the same base, so base 10 works. If the tool provides a log function that takes a base argument, that is even simpler when available.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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