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Multiply $5$ times $420$
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$9\sin\left(2100+15\right)+4\sin\left(3\cdot 420+25\right)$
Learn how to solve simplify trigonometric expressions problems step by step online. Simplify the trigonometric expression 9sin(5*420+15)+4sin(3*420+25). Multiply 5 times 420. Multiply 3 times 420. Add the values 2100 and 15. Add the values 1260 and 25.