3 years ago

Simplify. x+y -x²-y²/x-y

Mathematics

1 answer:

Anettt [7]3 years ago

5 0

X=222 y=58 nngvvhhydvkuvv

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Sin 3A = cos (A – 70ᵒ), where A is an acute angle then<br> A = ________________ ᵒ.

romanna [79]

Answer:

A = 40°

Step-by-step explanation:

$\sin 3A = \cos (A – 70ᵒ) \\ \\ \cos(90 \degree - 3A) = \cos (A – 70ᵒ) \\ \{\because \: \cos(90 \degree - \theta) = \sin \theta \} \\ \\ (90 \degree - 3A) = (A – 70ᵒ) \\ \\ 90 \degree + 70ᵒ = 3A + A \\ \\ 160 \degree = 4A \\ \\ A = \frac{160 \degree}{4} \\ \\ \huge \red{ \boxed{A = 40 \degree}}$