ꜱɪɴ ² + ᴄᴏꜱ = 1 ꜱɪɴ² = 1 – ᴄᴏꜱ ᴄᴏꜱ²= ¹ – ꜱɪɴ
in which chapter tell me ​

ꜱɪɴ ² + ᴄᴏꜱ = 1 ꜱɪɴ² = 1 – ᴄᴏꜱ ᴄᴏꜱ²= ¹ – ꜱɪɴ
in which chapter tell me ​

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