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This is a Content Analysis study.

Analysis of Textbooks on Trigonometric Identity Equations in the 1975 Curriculum, Merdeka Curriculum, and the 2nd Blitzer Trigonometry Book

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The Blitzer textbook excels in offering diverse and in-depth problem-solving opportunities.
The 1975 Curriculum materials are simple but lack systematic organization, affecting student learning.
The Independent Curriculum combines contextual elements, though it faces consistency challenges.
Cognitive analysis places the Blitzer book as superior, especially through the lens of the PISA framework.

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Content analysis reveals variances in approaches to trigonometric identities in textbooks, highlighting key strengths in the Blitzer book.

Susanti et al. (2025) studied this question.

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Content analysis reveals variances in approaches to trigonometric identities in textbooks, highlighting key strengths in the Blitzer book.