1.

If tan A =3/4,then prove that sin Acos A =12/25​

Answer»

Step-by-step EXPLANATION:

As sec2A−tan2A=1⇒secA=±tan2A+1

=±169+1=±1625=±45

⇒cosA=secA1=±54 

And sin2A+cos2A=1

⇒sinA=±1−cos2A=±1−2516

=±259=±53

⇒sinAcosA=2512

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