1.

cos​​​​6 π/16 + cos​​​​6 3π/16 + cos​​​​6 5π/16 + cos​​​​6 7π/16 = ?

Answer»

cos​​​​6 π/16 + cos​​​​6 3π/16 + cos​​​​6 5π/16 + cos​​​​6 7π/16 = ?



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