The four sum-to-product identities are statements that explain how two trig functions can be summed or subtracted to form a product. Learn how to...
We can use the product-to-sum formulas, which express products of trigonometric functions as sums. Let’s investigate the cosine identity first and then the sine identity. Expressing Products as Sums for Cosine We can derive the product-to-sum formula from the sum and difference identities f...
代数输入 三角输入 微积分输入 矩阵输入 求值 ∑n=1∞ntan(n1)
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Sum-to-Product Identities The sum-to-product identities are the true trigonometry statements that tell you how to turn the sum or subtraction of two trig functions into the product of two trig functions. Think of these definitions as telling you what something is equal to. You can go back ...