What makes a calculator 'scientific'
A scientific calculator goes beyond the four basic operations to handle trigonometry, logarithms, exponents, factorials, and parentheses-based order of operations.
Common functions
sin, cos, tan and their inverses handle angles. log and ln cover logarithms. x², √, and x^y handle powers and roots. Parentheses let you express order of operations clearly.
Degrees vs radians
Trig functions need to know which angle unit you're using. Most scientific calculators have a DEG/RAD toggle — getting this wrong is the #1 source of trig errors.
Calculators
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