give me all formulas of ch8 class 10 trigonometry
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cos2A + sin2A = 1
1 – sin2A = cos2A
1 – cos2A = sin2A
1 + tan2A = sec2A
sec2A – tan2A = 1
sec2A – 1 = tan2A
cot2A + 1 = cosec2A
cosec2A – cot2A = 1
cosec2A – 1 = cot2A
1 – sin2A = cos2A
1 – cos2A = sin2A
1 + tan2A = sec2A
sec2A – tan2A = 1
sec2A – 1 = tan2A
cot2A + 1 = cosec2A
cosec2A – cot2A = 1
cosec2A – 1 = cot2A
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