Question

sin(a+B) - 2 sina + sin(a-B)
cos (atB)-2 cosa + cos (a-B)​

Answer 1

2sina(cosb-1)

2cosa(cosb-1)

Step-by-step explanation:

sin(a+b)+sin(a-b)-2sina

cos(a+b)+cos(a-b)-2cosa

2sinacosb-2sina(by using identity)____eqn1

2cosacosb-2cosa

2sina(cosb-1)(by taking common in eqn 1)

2cosa(cosb-1)