2sinA sinB is equal to
Expression : 2sinA sinB
= $$sinAsinB + sinAsinB$$
Adding and subtracting $$(cosAcosB)$$
= $$(cosAcosB + sinAsinB) + (-cosAsinB + sinAcosB)$$
= $$(cosAcosB + sinAsinB) - (cosAcosB - sinAsinB)$$
= $$cos(A-B) - cos(A+B)$$
=> Ans - (B)
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