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Apr 25, 2020 · Answer: sinA/2×sinB/2×sinC/2 = (area of triangle)²/abcs Step-by-step explanation: We know, in a triangle of sides a,b,c and semi-perimeter (s)
一句话：解三角形中，直接将sinA可以直接换成a或者a换成sin A其实是一种不太好的解题习惯. 严格的解题过程，都是用正弦定理将 \sin A 换成 \frac {a} {2R} ，或者将 a 换成 2R \sin A. 只是在大多数情况之下， 2R 的下场都是被约分，比如说下面这道题：. 因此久而久之 ...
Find an answer to your question Prove that sinA + sin3A + sin5A + sin7A / cosA + cos3A + cos5A + cos7A = tan4A
Jan 20, 2018 · Mr Dubey went to the stationery shop he got one pen at 6 $. one. pencil. at at $4. one. eraser at 3 dollar. one. pencil. box. at$20. make. bill. for. …
Jun 30, 2014 · Which is the correct way to write 507,021 in expanded form?(can someone please help me i really neeed help)
Sep 27, 2018 · If cos A - sinA = root 2 sinA ,then proof that cosA + sinA = root2 cosA - 5901702
If secA×sinA=0 then find the value of A Get the answers you need, now! Tanmay0312 Tanmay0312 15.10.2019
Feb 24, 2018 · Answer. answered thisTo Prove:-cosec A-sin Acosec A+sin A=sec2A-tan2Asec2A+tan2ALHScosec A-sin Acosec A+sin A=1sin A-sin A1sin A+sin A=1-sin2A1+sin2ADividing numerator and denominator by cos2A, we get=1cos2A-sin2Acos2A1cos2A+sin2Acos2A=sec2A-tan2Asec2A+tan2A=RHSHence Proved. I hope this answer is helpful to you.
