please sloslove this question using these rules 2 Find the e

please sloslove this question using these rules

2. Find the exact value of cos 1(cos and explain how you obtained the result. 3. Use a sketch of a right triangle to find the exact value of sec(tan 1G).

Solution

y = cos^-1(cos7pi/6)

we can write : cosy = cos(7pi/6)

we can equate the angles on both sides:

y = 7pi/6

So, cos^-1(cos7pi/6) = 7pi/6