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If sinA + sin^2A = 1, then the value of the expression (cos^2A + cos^4A) is (a) 1 (b) 0 (c) 7 (d) 13

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If sinA + sin2A = 1, then the value of the expression (cos2A + cos4A) is 

(a) 1 (b) 0 (c) 7 (d) 13

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(a) sinA + sin2A = 1 

sinA = cos2A 

sin2A = cos4A 

cos4A = 1– cos2A 

cos2A + cos4A = 1 

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