Tana + cota = 7 then find tan²a+cot²a​

If sin to the power 4 a + sin square a is equal to 1 prove that one upon 10 to the power 4 a + 1 upon 10 square is equal to 1 and 10 to the power 4 a minus 10 square a is equal to 1 ​

Insert the correct sings > < =: 138, 168 126, 155

Aboy work 8 hours a day in what ratio did his earnings change when the pay was raised from rupees 50 per hour to rupees 500 a day​