Trigonometric EquationHard

Question

Two adjacent sides of a parallelogram ABCD are given by and . The side AD is rotated by an acute angle α in the plane of the parallelogram so that AD becomes AD′. If AD′ makes a right angle with the side AB, then the cosine of the angle α is given by

Options

A.
B.
C.
D.

Solution

⇒ cos α =

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