Elements of analytical geometry and of the differential and integral calculus (1866)
Davies, Charles, 1798-1876 · New York, Barnes & Co. · leaf 105
Let us designate the cor-responding angles by a and a. We shall then have, sm acos a and a = sm acos a Substituting these values in the last equation, and reducing, we obtain, A^ sin a sin a 4- -Z>- cos o cos a. = 0, and dividing both members by cos a cos a, we have, A^ tan a tan a + B- = 0, an…
Geometry, Analytic · Calculus
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