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10 circle chapter examples Ncert

Angles Subtended by Same Arc Theorem

circles theram

1. 22÷7×12×33 kaise solve hoga
   

1*2+2*3+3*4+...+m(n+1)=m(n+1)(n+2)/3

Hello,

Could you please help me to prove this?

sec2x-tan2x

differentiate x^(sinx-cosx) +x^2-1/x^2+1

Corollary of BPT

Construct a triangle PQR in which QR=6cm,angle Q=60 and PR-PQ=2cm