Is the built in calculator on your Smartphone lacking the complexity you need? Check out ALL-calculator!
In addition to what the built in calculator provides, this adds several useful features:
- Calculate the root, square root or cube root of a number
- Calculate in degrees, radians or grads
- Calculate sine, cosine, tangent, arc sine, arc cosine or arc cotangent
- Calculate using percentages
- Use 4 keyboards of 12 keys
- Custom user interface (skinnable)
- Internal precision of at least 15 digits"

This scientific calculator app costs $7.98 but you can use the free trial for 30 days.