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If tan A = 1 (0^@ lt A lt 90^@) and cos ...

If tan A = 1 `(0^@ lt A lt 90^@`) and cos B =`(1)/(sqrt2)(0^@ lt B lt 90^@)`, then find the value of cos (A + B).

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EDUCART PUBLICATION-SAMPLE PAPER 8-PART - A (SECTION - I)
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