Question

Simplify (-3) + (-12) - (-4) - 3x (-3)​

Answer 1

Answer:

Given

-3-12 + 4 + 9

-15 + 13

= -2 Answer

Explanation

(+) × (+) = +

(+) × (-) = -

(-) × (+) = -

(-) × (-) = +

so -3

+ × (-12) = -12

- × (-4) = +4

-3 × (-3) = 9

then put value solve easy

we get - 2

Answer 2

Answer:

→ Let α=tan

−1

x,β=tan

−1

y

As tan(α+β)=

1−tanαtanβ

tanα+tanβ

⇒tan(α+β)=

1−xy

x+y

⇒α+β=tan

−1

(

1−xy

x+y

)= tan

−1

x+tan

−1

y