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cos (π/4 – x) cos (π/4 – y) – sin (π/4 – x) sin (π/4 – y) = sin (x + y)
cos (π + x) cos (– x) / sin (π – x) cos (π/2 + x) = cot² x
sin (n + 1)x sin (n + 2)x + cos (n + 1)x cos (n + 2)x = cos x
cos (3π/4 + x) – cos (3π/4 – x) = –√2 sin x
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