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The value of cos 1° cos 2° ⋯ cos 90° is:
The value of 5 sin²90° − 2 cos²0° is :
Assertion (A) : In a right angle triangle ABC, ∠B = 90°. Therefore the value of cos (A + C) is equal to 0. Reason (R) : A + B + C = 180° and cos 90° = 0.
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