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cloudboy55:
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To prove -- cosA+sinA = +-1
Proof ---cosA-sinA=1
squaring on the both sides
cos^2A+sin^2A-2cosA×sinA=1
1-2cosA×sinA=1
-2cosA×sinA=0
cosA ×sinA=0
(cosA+sinA)^2
cos^2A+sin^2A+2cosA×sinA
1+2×0
1
hope this answer helps u please mark it as a brainliest...
Proof ---cosA-sinA=1
squaring on the both sides
cos^2A+sin^2A-2cosA×sinA=1
1-2cosA×sinA=1
-2cosA×sinA=0
cosA ×sinA=0
(cosA+sinA)^2
cos^2A+sin^2A+2cosA×sinA
1+2×0
1
hope this answer helps u please mark it as a brainliest...
thanks appreciate it
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