Question

Prove that tan9A-tan5A-tan4A=tan9A.tan5A.tan4A

Answer 1

Answer:

To prove that: tan13A - tan9A - tan4A = tan13A tan9A tan4A

tan 13 A equals tan open parentheses 9 A plus 4 A close parentheses equals fraction numerator tan 9 A plus tan 4 A over denominator 1 minus tan 9 A times tan 4 A end fraction

rightwards double arrow tan 13 A open parentheses 1 minus tan 9 A times tan 4 A close parentheses equals tan 9 A plus tan 4 A

rightwards double arrow tan 13 A minus tan 13 A times tan 9 A times tan 4 A equals tan 9 A plus tan 4 A

rightwards double arrow tan 13 A minus tan 9 A minus tan 4 A equals tan 13 A times tan 9 A times tan 4 A

Answer 2

Step-by-step explanation:

tan 0 = tan 180?

preparation of soil