72.

73a. Look at magic triangle in the answer block at left. Write the

formula when r is the unknown quantity.

73a.

b.

Now, assume that y has become the unknown quantity.

Isolate y.

c.

Given the value of y and r, isolate the unknown. Write the

73b. y = sin x r

formula in the space below.

73c.

74a. Write the function formula for tan .

74a.

b.

Now, place the formula in a magic triangle.

74b.

c.

Look at your magic triangle. Isolate x; write the formula here.

74c.

Isolate the unknown when tan and x are given.

d.

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