Which mathematics textbook's marketing campaign famously pivoted from academic-focused advertising to student-centered messaging, resulting in it becoming the best-selling calculus textbook of all time?

In the world of mathematics education, certain textbooks and resources have shaped generations of students and professionals alike. Behind these influential works are remarkable marketing campaigns that transformed how mathematics is taught and learned. Test your knowledge about one of the most significant product marketing pivots in the history of mathematical publishing!

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James Stewart's 'Calculus' (1987), which used the tagline 'Calculus that makes sense'
Michael Spivak's 'Calculus' (1967), marketed as 'The mathematician's choice'
Howard Anton's 'Calculus' (1980), with the campaign 'Building intuition through visualization'
Serge Lang's 'Calculus' (1964), advertised with 'The clear path to mathematical mastery'