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Multiply $5$ times $80$
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$9\sin\left(400+15\right)+4\sin\left(3\cdot 80+25\right)$
Learn how to solve simplify trigonometric expressions problems step by step online. Simplify the trigonometric expression 9sin(5*80+15)+4sin(3*80+25). Multiply 5 times 80. Multiply 3 times 80. Add the values 400 and 15. Add the values 240 and 25.