sin( A-B )+ sin A+B/cos (A+B )+ cos(A-B)= tan A ​

Question

sin( A-B )+ sin A+B/cos (A+B )+ cos(A-B)= tan A

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Samantha 3 months 2021-10-15T12:44:58+00:00 1 Answer 0 views 0

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    2021-10-15T12:46:50+00:00

    Answer:

    Step-by-step explanation:

    Since,

    sin(x+y) = sinx × cosy + cosx × siny

    sin(x-y) = sinx × cosy – cosx × siny

    cos(x+y) = cosx × cosy – sinx × siny

    cos(x-y) = cosx × cosy + sinx × siny

    We have to prove that,

    sinacosb+cosasinb+sinacosb-cosasinb/cosacosb-sinasinb

    2sinacosb/2cosacosb

    tan a

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