Which expression is equivalent to sin(1.8x) sin(0.5x)?
Mathematics
connor9189
Question
Which expression is equivalent to sin(1.8x) sin(0.5x)?
1 Answer

1. User Answers Anonym
Hum, this problem was difficult. You use the next expression to solve this problem. \[\cos (A  B) = \cos A \cos B + \sin A \sin B \] \[\cos (A + B) = \cos A \cos B  \sin A \sin B\] \[\cos (A  B )  \cos (A +B ) =2 \sin A \sin B\] So \[\sin A \sin B = 0.5 \left( \cos(A  B)  \cos(A + B) \right)\] A = 1.8 x, B = 0.5 x \[\sin (1.8x) \sin (0.5x) = 0.5\left( \cos(1.80.5)x  \cos(1.8+0.5)x \right)\]\[= 0.5 \left( \cos(1.3x)  \cos (2.3x) \right)\] It's finish !!