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Free mini-course on trigonometry: https://vk.cc/bX2PPN Course on trigonometry and task 13 of the Unified State Exam: https://uchus.online/courses/new/4 Website: https://uchus.online/ VK group: https://vk.com/uchus.online Trigonometric functions sine, cosine, tangent, cotangent Definition of values of trigonometric functions of base angles Trigonometric circle Trigonometric functions of a numerical argument Basic trigonometric identity Formulas for the cosine of the sum and difference and the sine of the sum and difference Formulas for the cosine of a double angle and the sine of a double angle Signs of cosine and sine in different quadrants Table of values of trigonometric functions