Question

Pls answer it fast I want it right now ​

Answer 1

Step-by-step explanation:

I hope It'll help uh....

Answer 2

Formulas Used:

cosA=sin(90-A)\\\\tanA=cot(90-A)\\\\cos^2A+sin^2A=1\\\\tanA.cotA=1

Proof:

Taking Left Hand Side,\dfrac{cos^2(45+\theta)+cos^2(45-\theta)}{tan(60+\theta).tan(30-\theta)}\\\\\\=\dfrac{cos^(45+\theta)+sin^2(90-45+\theta)}{tan(60+\theta).cot(90-30+\theta)}\\\\\\=\dfrac{cos^2(45+\theta)+sin^2(45+\theta)}{tan(60+\theta).cot(60+\theta)}\\\\\\=\dfrac{1}{1}\\\\\\=1

Right Hand Side = Left Hand Side.

Hence Proved.

✓✓ Put all the value

{√3+1} × (√3-1)

°°°°°¥ (a+b) × (a-b) = (a^2-b^2)

(3-1) = 2

1+2 = 3

So ans is 3

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