cosC+cosD= 03:13 cosC-cosD= 03:19 2sin40^(@)sin10^(@)= 01:13 2sin25^(@)cos15^(@)= 01:04 নীচের কোন বিবৃতিটি সত্য? 03:41 sin""(5theta)/2 sin"(3theta)/2-এর মান নীচের কোনট...
From the formula, we can directly substitute the values: cosA+cosB+cosC=1+rR 4. Identifying the Correct Option: Now, we compare our result with the given options: - (A) rR - (B) Rr - (C) 1 - (D) 1+rR Our derived expression matches option (D). 5. Conclusion: Therefore, th...
By using this identity, we can write the formula for the function sin(B−C). Answer and Explanation: Solution: {eq}\begin{align*} \text{Simplifying LHS}: \ \ &= \frac{\sin (A-B)}{\cos A \cos B} + \frac{\sin (B-C)}{\cos B ...
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