alleryStart learning →Subtracting cos(A+B) from cos(A−B) yields the product
A2 cosA cosB
B2 sinA sinB
C−2 sinA sinB
D2 sinA cosB
Answer & Solution
Correct answer: B. 2 sinA sinB
Subtracting the cos(A + B) expansion from the cos(A − B) expansion leaves 2 sinA sinB.
Keep practising Trigonometry - II
Browse all Trigonometry - II questions for MHT-CET, or explore more Mathematics topics.
Related questions
If sinθ = 1/2 with θ acute, what is the value of sin 3θ − 3 sinθ?Which of these is the correct value of sin(3π/2 − θ)?In the second quadrant, sin(π − θ) is equal toUsing a period of 180°, tan 840° reduces toRemoving two full turns, cos 930° reduces toReducing 495° to a first-turn angle, sin 495° equalsFor the angles of any triangle, the sum sin2A + sin2B + sin2C isThe triangle identity for squares of sines gives sin²A + sin²B + sin²C =