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The first three terms of a geometric series are sin? cos? and 0.5 where ?...

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The first three terms of a geometric series are sin? cos? and 0.5 where ? is a constant(a) Show that 2sin^? + sin? -2 = 0Given that lies in the interval 90 < ? < 180(b) find the value of ? giving your answer to one decimal place.(c) Hence prove that this series is convergent.(d) Find, two significant figures, S?

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