Which company first mass-produced and sold a handheld calculator that could perform all trigonometric functions (sin, cos, tan) and sold over 1 million units in its first year?

Before computers dominated the mathematical tools market, handheld calculators revolutionized how people performed calculations. In the 1970s, a fierce battle emerged between electronics companies to dominate this lucrative market. Mathematical capabilities, price points, and innovative designs determined which brands would succeed in this competitive landscape. Test your knowledge about this pivotal moment in the intersection of mathematics and retail history!

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Texas Instruments with the SR-50 in 1974
Hewlett-Packard with the HP-35 in 1972
Casio with the fx-10 in 1975
Sharp with the EL-8 in 1973