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75. cos2x−sin2x=1 76. 2sin2x+cosx−1=0 77. 2cos2x−3sinx−3=0
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75. cos2x−sin2x=1 76. 2sin2x+cosx−1=0 77. 2cos2x−3sinx−3=0
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Thu Jul 14, 2022 4:02 pm
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answerhappygod
75 Cos2x Sin2x 1 76 2sin2x Cosx 1 0 77 2cos2x 3sinx 3 0 1 (17.26 KiB) Viewed 32 times
75. cos2x−sin2x=1 76. 2sin2x+cosx−1=0 77. 2cos2x−3sinx−3=0