If cos a + cos square is equal to 1 prove that sin square a + sin 4 is equal to 1
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Step-by-step explanation:
cos+cos²a=1
cosa=1-cos²a
cosa=sin²a.........(1)
cos²a=sin⁴a.......(2)
sin²a+sin⁴a
=cosa+cos⁴a
=1
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