Grade 10Trigonometry
If tanA= 1 and tan B=√ 3. Find cos A.cos B- sin A.sin B
If tanA= 1 and tan B=√ 3. Find cos A.cos B- sin A.sin B
1 Answer
Arun
Dear student
tan (A + B) = 1 + sqrt3 / 1 – sqrt 3
hence cos (A + B) = (1 – sqrt 3 )/ 2sqrt2
also cosA cosB – sin A sinB = cos (A + B)
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