टू साइन इनटू 45 डिग्री माइनस थीटा कॉस 45 डिग्री माइनस थीटा इज इक्वल टू कॉस्ट टू थीटा
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by using the identity.. sin2x = 2sinx cosx ..
then you will get the answer..
Step-by-step explanation:
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