The expression sin(18+theta)cos(72-theta)+cos(18+theta)sin(72-theta) equals
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Step-by-step explanation:
we know that sinacosb + cosasinb = sin(a+b)
so by taking a = 18 + theta
and b = 72 - theta
answer is sin(a+b)
putting a and b
sin (18 + theta + 72 - theta)
= sin 90
= 1
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