[Merged by Bors] - chore(src/analysis/special_functions/trigonometric/basic) : prove continuity of sin/cos/sinh/cosh without derivatives #9502
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In a future PR, I want to split all files in the special_functions folder to avoid importing calculus when not needed (the goal is to avoid importing it in the definition of lp_space in measure_theory). This PR changes the proofs of continuity of trigonometric functions.