Question

اگر
(2)
sin@+ sin²@=1
تو دکھایئے کہ :
cos²@ + cos⁴@= 1,​

Answer 1

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Answer 2

معطى, sin@ + sin²@ = 1

⇒sin@ = 1 − sin²@ = cos²@

لذلك, cos²@ + cos⁴@ = cos²@(1 + cos² @)

= sin@(1 + sin@)

= sin@ + sin²@ = 1

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