6sin^2 x-12cos x-10=0 Sin^2 x+5sin x cos x+6cos^2x=0 4th x-12ctg x+13=0 5-8cos^2 x=sin2x

Question

6sin^2 x-12cos x-10=0
Sin^2 x+5sin x cos x+6cos^2x=0
4th x-12ctg x+13=0
5-8cos^2 x=sin2x

Answer 1

Применены тригонометрические формулы

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