sin(a+b)xsin(a-b)= ?

pl tell me how to solve this problem
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1 Answer

sin(a + b)xsin( a - b)=

(( sin(a+b) =sinacosb + cosasinb, and sin(a-b)=sinacosb-cosasinb))

x(sinacosb+cosasinb)(sinacosb-cosasinb) =

x((sinacosb)^2 -(cosasinb)^2)
by Level 8 User (36.8k points)

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