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I. sin^4 A - cos^4 A = sin^2 A - cos^2 A [ do not miss any of the step]

ii. provide me the square formulaes [ like sin^2 A + cos^2 A = 1 ]
iii. If the angular diameter of the moon be 30 minutes, how far from the eye a coin of diameter 2.2 cm be kept to hide the moon
plz answer as soon as possible bcz its urgent
i will mark it as brainliest answer


Sin^4A-cos^4A=  (sin^2A)^2-(cos^2A)^2=    (sin^2A+cos^2A)(sin^2A-cos^2A)=

0 0 0
thanks buddy
provide me iii. as well if u can
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