43/5 s a decimal or a mixed fraction

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

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What is the probably of getting heads when poing a coin and getting a number greater than or equal to 5 when rolling a single diea) 1/6b) 1/3c) 1/4d) 1/12