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Q.

If cos⁡(A−B)=35 and  tan⁡ Atan⁡B=2 then

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a

cos⁡A cos⁡B=15

b

sin⁡A sin⁡B=−25

c

cos⁡A cos⁡B=-15

d

sin⁡A sin⁡B=−15

answer is A.

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Detailed Solution

cos⁡(A−B)=35or  5cos⁡Acos⁡B+5sin⁡Asin⁡B=3   ------------(1)From the second relation , we getsin⁡Asin⁡B=2cos⁡Acos⁡B  -----2⇒cos⁡Acos⁡B=15 and sin⁡Asin⁡B=25
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If cos⁡(A−B)=35 and  tan⁡ Atan⁡B=2 then