Sdelayte 85 nomer s resheniyem plsss!!!

Question

Sdelayte 85 nomer s resheniyem plsss!!!

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Answer 1

Sina = b/c; cosa= a/c
tgB=b/a;
sin2a = 2sinacosa = 2*(b/c)(a/c)
sin2a*tgB=2*(b/c)(a/c)*(b/a)=(2b^2*a/c^2*a)=(2b^2/c^2)
Ответ: D) 2b^2/c^2

Comments

Bolshoye spasibo!!