Question

prove that sin^2thetta +cos^2thetta=1
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Answer 1

Step-by-step explanation:

answer and explanation given in picture

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Answer 2

Answer:

Step-by-step explanation:

let the triangle ABC angle thetha at C

then sin thetha = AB/AC

       cos thetha = BC/AC

sin square thetha + cos square thetha = AB square + BC square / AC square

we know by pythagoarus theorem AB square + BC square = AC square

so,   sin sq thetha + cos sq thetha = AC sq / AC sq

                                                        = 1

Hence Proved

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