liann8776
18.12.2020 •
Mathematics
Prove (2cosa+1)(2cosa-1)=2cos4a+1
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Ответ:
tan(θ) + cot(θ) = sin(θ) / cos(θ) + cos(θ) / sin(θ)
tan(θ) + cot(θ) = sin²(θ) / (sin(θ) cos(θ)) + cos²(θ) / (sin(θ) cos(θ))
tan(θ) + cot(θ) = (sin²(θ) + cos²(θ)) / (sin(θ) cos(θ))
tan(θ) + cot(θ) = 1 / (sin(θ) cos(θ))
tan(θ) + cot(θ) = csc(θ) sec(θ)