Question

Prove that 2+2=4 by trigonometry.

Answer 1

2(sin+cos)=2 (we know)

Put in 4

We get 4(sin+cos)

2×2(sin+cos)

But 2+2=2×2

2+2(sin+cos)

2(sin+cos)+2(sin+cos)

2+2=rhs

So 2+2=4

Answer 2

Trigonometry

Trigonometry is the measurement and study of length  and sides  of a right angled triangle.

Trigonometric identities

They are algebric equation that are satisfies the values for a right angled triangle.

To prove

2+2=4

We know the trignometric identity,

$sin^{2}A +cos^{2}A =1$

Multiply both sides by $sin^{2} A+cos^{2} A$

L.H.S

$\mathsf{ 2 \times sin^{2} A+cos^{2} A +2 \times sin^{2}A +cos^{2}A}$

on apllying values,

$\mathsf{ 2 \times 1+2 \times 1}$

$\mathsf{2+2}$

$\mathsf{4= R.H.S}$