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RP^2 = PQ^2 + QR^2 - 2 . PQ . QR cos Q
5^2 = 7^2 + 6^2 - 2 . 7 . 6 cos Q
25 = 49 + 36 - 84 cos Q
84 cos Q = 60
Cos Q = 60/84 = 5/7
Cos Q = 5/7 = sa/mi => de = √(7^2 - 5^2) = √24 = 2√6
Sin Q = de/mi = 2√6 / 7
Tan Q = de/sa = 2√6 / 5