Question

13. If sinQ+ cosQ = 1 then find the value of sinQ.cosQ

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Answer 1

Answer:

sinQ+ cosQ = 1

squaring both sides

we get

sin²Q + cos²Q + 2sinQ.cosQ = 1

1 + 2sinQ.cosQ = 1

2sinQ.cosQ = 0

sinQ.cosQ = 0

Answer 2

Hey mate

here is your answer

(sinQ+cosQ)^2=sin^2Q+2sinQcosQ+cos^2Q

1=1+2sinQcosQ

0=2sinQcosQ

0=sinQcosQ

hope it helps you