In right triangle ABC, 90° at C the sides are in the ratio 1 : 1 : � – McqOptions

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1.	In right triangle ABC, 90° at C the sides are in the ratio 1 : 1 : √2.Then find the value of cos A cos B – sin A sin B
A.	1
B.	0
C.	1/2
D.	1/√2
Answer» C. 1/2

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