Question

Please prove no. 4,6,8 and 10. 3 points for each answer. Class 10 ICSE Maths.​

Answer 1

Answer:

4. tan A-cot A= (sin A/cos A) - (cos A/sin A)

=(sin^2 A - cos^2 A)/ sinA.cosA

=(1-cos^2 A- cos^2 A)/ SinA.cosA

=(1-2cos^2 A)/ sin A. cos A

proved

6. (1-tanA)^2 + (1+tan A)^2

=1+tan^2A-2tanA+1+tan^2A+2tanA

=2+2tan^2A

=2(1+tan^2A)

=2sec^2A

10. sec^2A+cosec^2A

=(1/cos^2A)+(1/sin^2A)

=(sin^2A+cos^2A)/cos^2A.sin^2A

=1/cos^2A.sin^2A

=sec^2A.cosec^A...............proved

Answer 2

Your answer is related to attachment....☝☝

Please mark as brainliest....❤❤