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Answer:
sinx=a/b
sin²x+cos²x=1
cos=√1-a²/b²
=√b²-a²/b²
=√b²-a²/b
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Easy. .toh .. hai. .
Dekh Sin =Opposite / hypo. . hai. .
Toh . yeh Ek aaisa.. triangle hai. jiska.. Ek . side. . (opposite) Wala.. a hai. .aur . uska Hypo.. b hai..
Third side.. ho gai . √b²-a².
Cos=adj / hypo. = √b²-a²/b. .
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