if cosecA+cotA=k then prove that cosA= k²-1/k²+1
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Answer:1/sinA+cosA/sinA=k
1+cosA/sinA=k
1+cos^2A/sin^2A= k^2
componendo dividendo
1+cos^2A-sin^2A/sin^2A+sin^2A= k^2-1/k^2+1
2cos^2A/2sun^2A=k2-1/k2+1
cot2A
Step-by-step explanation:
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