Solve =tau*tau+tau*tau

$$= \tau \cdot \tau + \tau \cdot \tau$$

Evaluate

$$8\pi ^{2}\approx 78.956835209$$

Solution Steps

Substitute 2 * \pi for \tau.

$$2 * \pi \cdot 2 * \pi + 2 * \pi \cdot 2 * \pi$$

Multiply \pi and \pi to get \pi ^{2}.

$$2\pi ^{2}\times 2+2\pi \times 2\pi$$

Multiply \pi and \pi to get \pi ^{2}.

$$2\pi ^{2}\times 2+2\pi ^{2}\times 2$$

Multiply 2 and 2 to get 4.

$$4\pi ^{2}+2\pi ^{2}\times 2$$

Multiply 2 and 2 to get 4.

$$4\pi ^{2}+4\pi ^{2}$$

Combine 4\pi ^{2} and 4\pi ^{2} to get 8\pi ^{2}.

$$8\pi ^{2}$$