#10 class maths Some other trigonometric formulas are given below : 1. sin ( 90 ° - 0 ) = cos 0 2. cos ( 90 ° – 0 ) = sin 0 3. tan ( 90 ° – 0 ) = coto 4. cot ( 90 ° – 0 ) = tan 5. sec ( 90 ° - 0 ) = coseco 6. cosec ( 90 ° - 0 ) = seco 7. sin20 + cos2 0 = 1 8. sec2 0 = 1 + tan - 0 for 0 ° = 0 < 90 ° 9. Cosec2 0 = 1 + cot2 for 0 ° s O = 90 °
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